Market Spotlight

Is a Trans Am the best alternative to the Buick GNX?

by Eddy Eckart
17 February 2023 8 min read
Mecum, RM Sotheby's

Can a substitute ever be as satisfying as the real thing? It’s a question that we all seem to struggle with from a young age. It’s not always broccoli vs ice cream, either—often, it’s much closer, like Matchbox vs Hot Wheels. Each have their own high points, and though you may prefer one, and all the hype tells you that it’s superior, the other just might impress if you give it a chance.

Take the 1987 Buick GNX and the 1989 Pontiac Trans Am 20th Anniversary Edition: they’re the protagonists in what might be the ultimate ‘80s domestic substitution challenge. Since the Black Buick’s prices remain stratospheric, could it be that the best alternative comes from cross-town Pontiac?

We can see the furrowed brows of the Buick faithful through the screen. Yes, you’ve got a point—despite nearly identical drivetrains, the differences between the Buick and the Poncho are black and white, much like the sole color choice offered on each car. Besides, wouldn’t a lesser-trim Regal scratch that GNX itch without the GNX price tag? Buick built thousands of the turbo Regal variants between 1978 and 1987, from the super-niche 1987 Turbo Regal Limited (1035 produced) to the more garden-variety Grand Nationals and T-Types, and they cover a broad price spread, too. But, if you want a range-topping, Ferrari-eating, force-fed piece of ’80s American history, and you like your cars ultra-rare, it’s either the GNX or the ’89 turbo T/A.

This turbo turf war has its roots in 1978, when Buick made quite the pivot. From the city that forged the formula for the V-8 muscle car, the Regal Sport Coupe’s fancy turbocharged 3.8-liter V-6 debut signaled a new path to power. Sure, its 165 hp and 245 lb-ft did little to evoke the tire-evaporating 455 in Buick’s departed GS, but it was a step in the right direction. (It was also the only turbocharged domestic on the market that year, with Porsche, Saab, and Mercedes-Benz the only others with turbocharged models in the U.S.) Oldsmobile and Chevy experimented with turbos in the ’60s, but they dropped the comparatively complex boosted engines from their lineups relatively quickly. Pontiac would add a turbo to the 4.9-liter V-8 in the 1980 and ’81 Trans Am, but of GM’s brands, it was Buick that committed to the technology.


Sticking with forced induction led to increasingly powerful—if outwardly mundane—Buick Regals roaming the streets in the early ’80s. The Grand National nameplate emerged in 1982 as an aesthetic and interior celebratory package for Buick having won the Manufacturer’s Cup in the NASCAR Winston Cup Grand National Series. Available on base-engine Regals or the Regal Sport Coupe with the turbo, the ’82 Grand National was the first step in building the bad-boy visual for Buick’s turbo coupes.

Though you could pick out a Regal T-Type (the turbocharged trim that replaced the Sport Coupe) in a variety of colors, 1984 marked first year of the black-only Grand National, its 200 hp and 300 lb-ft rating, and its TV ads with a Buick-ized version of George Thorogood’s “Bad to the Bone.” People took notice. Buick subsequently made incremental improvements in engine management, intercooling, and ignition to pressurize their variety of turbo Regal trims until the blown Buick crept into into Corvette power territory in 1987 with 245 hp and 355 lb-ft of torque.

By then, word was out. In addition to the turbo Regal’s reputation for speaking softly and cruising with a big stick, 1987 would be the final year for rear-wheel drive Regals. Turbo Buick fans came out in droves to snap up 27,590 units across all trims, or more than three times those sold in 1986.

RM Sotheby’s

Ahead of this sunset, Buick decided a commemoration was appropriate, and got going on the ultimate second-gen Regal—the GNX. They reached out to Automobile Specialty Company (a division of another ASC—American Sunroof Company) and McLaren Engines (not to be confused with McLaren the automaker) to aid in building a limited run of high-test, blacked-out turbo goodness. One look at a GNX and you know it’s different than the standard GN, though not obviously so—subtle badges, fender vents, and flares surrounding black mesh wheels are the tells.

ASC/McLaren’s effort on the engine was more a thorough massage than a complete working over: boost increased to 15 lbs. and flowed through a larger turbo with ceramic turbine wheel, and the computer got a more aggressive tune. A new, large-diameter dual exhaust helped the turbo breathe better while revised intercooler piping offered greater thermal efficiency. The result was an almost-certainly underrated 276 horsepower and 360 lb-ft of torque, managed through a 200-4R transmission with a new valve body and put to pavement by a reconfigured rear end featuring an F-body-style torque arm, Panhard bar, and strengthened differential cover.

RM Sotheby’s

All that power launched the GNX to a 4.7-second 0-to-60 mph time and a then-brutal 13.5 seconds at 102 mph quarter mile result in Car & Driver’s testing. On the strip, this was good enough to place Buick’s bruiser at the pointy end of the fastest production cars available. It’s best to keep GNXs on the straight-and-narrow, though: “[c]learly, the engine and the chassis are in separate leagues,” wrote Tony Assenza in the May, 1987 issue of Car & Driver. “What we have here is a great powerhouse of a motor looking for a nice place to live.”

That criticism and underwhelming chassis didn’t matter a lick. Enthusiasts knew what these cars were about and loved every inch of them. Buick produced a mere 547 GNXs, and buyers scooped them up in a frenzy, often paying well over the $29,389 MSRP. Between the brawny motor and badass reputation cultivated by the Grand National that preceded it, the top-dog GNX has enjoyed a strong secondary market from the beginning and its legendary status has long been secure.


Younger readers might be surprised to learn GM didn’t always have a reputation as a monolithic corporation. For the first 50 years of operation, its many brand divisions operated semi-autonomously, utilizing and developing different technology that was at times shockingly distinct from its corporate compatriots. In other words, Oldsmobile did its own thing, as did Cadillac, Buick, Chevy, GMC, and Pontiac. By the 1980s, though, GM Chairman and CEO Roger Smith’s cost-cutting overhaul ushered in extensive tech trade and sharing between the GM siblings, but there was still significant internal competition.

So, while Pontiac was probably sick of its halo 305-cubic inch, tuned-port injection Trans Ams losing drag races to Buick’s personal luxury coupes, they weren’t above harnessing a bit of Buick’s turbo magic to do something about it. Pontiac decided to inject the turbo V-6 into the 20th Anniversary Trans Am, and started the project with their top-trim GTA model and all the WS6 handling upgrades. Unique shocks and shorter front springs were swapped in to match the engine’s lighter-than-small-block weight, and larger brakes from the race-oriented 1LE package found their way behind the front wheels. A T-Top roof configuration was an option, as were leather seating surfaces—though tan was the only interior color. Most turbo T/As came fully-optioned with leather and the removable roof; finding a cloth interior or a hardtop is a challenge, much less finding one with both. Since the car paced the Indy 500 that year, pace car door decals were included and installed by the dealer at the buyer’s discretion.

Despite a smaller footprint than the third-gen Firebird’s existing 305-ci V-8, Swapping in the 3.8-liter six turned out to be a bit of a challenge. The Firebird’s strut towers made for a less accommodating bay than the larger Buick, so Pontiac swapped in compact cylinder heads from the 3800-series engine and selected shorter pistons to achieve its desired 8.0:1 compression ratio. Like Buick, Pontiac outsourced these tweaks, using Performance Automotive Systems to build the engines and complete final assembly.


The remainder of the engine components were a mix and match of existing Buick parts and Pontiac-specific selections, yielding 250 horsepower and 340 lb-ft of torque—figures that, like the GNX, are considered substantially underrated. Despite being down 26 horses on paper against the GNX, Car & Driver reported that the turbo T/A was a tenth quicker both to 60 mph and through the quarter mile. Pontiac had bragging rights on a technicality—these straight line numbers are effectively a dead heat, and it was anyone’s bet at a Woodward Avenue stoplight.

Fulfilling C&D’s wishes, the T/A’s chassis was a better fit for the Buick V-6’s prodigious power. The F-body exhibited greater balance and grip, and was overall a more complete performance package, if a bit less comfortable on the boulevard.


Sources put production at around 1550 turbo Trans Ams—still a very limited run, but nearly three times the 547 GNXs that reached showrooms. While it briefly stood at the top of the heap of domestic performance, it never gained the cult following that the GNX had. Add in the 20th Anniversary Trans Am’s lack of visual differentiation from the lesser Trans Am GTA, and you’ve got the proper mix to make it less valuable to collectors—and simultaneously an opportunity for those who want a usable, affordable classic.

As with many Radwood-era rarities, pristine examples of both cars have increased significantly in value, though the Buick stands head and shoulders above the Pontiac. Ten GNXs have sold on Bring a Trailer for $200,000 or more, and that’s not just from the hot heyday of the pandemic market—the first one on BaT to cross that mark did so in 2019. Granted, these are almost exclusively museum pieces with minimal mileage and delivery plastic covering the seats, but they slot neatly in between our Price Guide #1 condition value of $288,000 and condition #2 (excellent) $179,000 value. Even driver-quality #4 condition GNXs sit at the $80,000 mark. Values have softened ever so slightly for all but the top-tier—prices peaked in July last year and have remained stable at slightly lower levels since then.

About 70% of quotes for the GNX come from Gen-Xers, which is nearly double their share from three years ago. Boomers have seen their share of quotes taper to about 20%. Millennials are becoming more interested in the GNX, but their share is still only about 5%. Insured demographic shares are similar: Gen-X leads with 59%, 26% are owned by Boomers, seven percent are owned by Millennials, and eight percent by Pre-Boomers.

In contrast, you could take home four (!) #1-condition turbo T/As for the price of a single #1-condition GNX, or one pristine example for less than a driver-quality GNX. Across all conditions, the Pontiac's prices continued to rise for one quarter longer than the Buick's. Unlike the GNX, which throttled back its values slightly before leveling off at the end of the year, the turbo T/A has held steady as the market has begun to cool. This lag and hold does suggest the possibility for a substitution effect, or at least greater market recognition.

The T/A finds itself sought after by the two dominant generations in the market—Boomers and Gen-X. It's not particularly surprising for a rare, niche model to appeal most to those who were alive when it debuted. Together, the two almost evenly split nearly 90% of the quotes sought for the turbo T/A. Millennial interest is slight. Policies indicate that Gen-X owns 52% of the turbo Trans Ams insured with Hagerty, with Boomers coming in at 38%. Millennials have a two percent share, and Pre-Boomers make up an eight percent share. The average insured value of '89 turbo T/As is a staggering 4.8 times less than that of the GNX.


What does this massive delta in values come down to? Mythology and sinister looks that are the last gasp of the muscle-car-era silhouette—the big, bad Buick has those in spades, and they certainly help the appeal. Three-figure production numbers don't hurt the GNX, either. As for the Trans Am, it might be handsome but it's not nearly as mean, and aside from some badging, it looks identical to its V-8-powered GTA-trim sibling. The pace car decals that adorn many of the cars are an acquired taste as well.

Still, there's something to be said for the GNX's affordable cousin. On today's SUV-filled roads, it's hard not to be drawn to the '80s white-on-gold wedge that is the turbo T/A. It might not intimidate the way the GNX does, but its looks are similarly representative of its era. Between the two, the turbo T/A is objectively the better all-rounder, even if the GNX gets the win for comfort and has a stronger following. While few are likely to pursue a top-flight 20th Anniversary Trans Am Turbo over a concours GNX as an investment, for those who drive their collector cars and take pride in owning a rare ride, the turbo T/A scratches that '80s GM turbo dominance itch pretty well.


  • MichaelB says:

    Yes, there is something about that jet black Buick that the Firebird is missing. As good as that Trans Am is, the turbo Buick has the stuff.

  • Victor says:

    I have them both. The Buick has the badass looks, but kick the TA up to 140 mph in no time, with one hand on the steering wheel with a complete planted and confident feel (largely due to the aerodynamics), and you quickly appreciate the TA is the better performance car, looks withstanding.

  • Andy says:

    I’ve driven GNs (never a GNX), I don’t dislike them, but don’t “get” it. The G Body is from the depths of malaise era GM. Interior is about the nadir of GM quality control/plastic parts.

    They’re fine cars. Not quarter million dollar cars. The motor is nifty, but c’mon. It’s a 3.8 with a hairdryer on it. It’s also not un-buildable or exceptionally special. GM made millions of them.

    A bone stock C5 Z06 will run with it to 60, beat it to the quarter, stop better and corner better, and you can build a very, very nice building and buy a ton of upgrades to that Corvette, take the family on vacation, and still have cash. (equally terrible plastics, btw.)

    The F Body was a better looking, handling, and driving car in every respect. Didn’t love them coming of age (I was ten-ish when the GN came out), but they’re really grown on me with time. I think a GTA or Turbo TA is a way better alternative (though not as rare) that is much better driving, looking, and a steal at a fraction of the price.

    Just don’t get the G Body love…

  • paul s murray says:

    Simple. I’ll take a a Mustang SVO, a fresh set of sticky’s and a twisty country road. And with the significant $’s saved? I’m not sure. In today’s environment …what’s Raytheon stock going for?

  • b krug says:

    The TA is a bargain in the market right now, I don’t think they will be that way 5 years from now as. more people realize how well they handle.

  • Fred says:

    I worked for a Pontiac dealer when the turbo t/a came out. It also was around at the same time as the SLP modified Firebird formulas. I drove the turbo t/a, if you didn’t power brake it from a standing start, you floor it………1001, 1002, 1000..boom, then it went. It still didn’t pull as hard as a forumla 5 speed 5.7 tpi with a cam, header, exhaust and chip from SLP. And the sound of the SLP exhaust was just fantastic.

  • Ken Sousa says:

    First, I have to admit to being a Buick fan boy. At 19 years old I didn’t know a carburetor from a generator. I bought a ’55 Century from a relative who had successfully drag raced it from new and, because I broke things like transmissions (he’d converted it from a Dynaflow to a 3 speed column shift out of a ’54 Buick) and clutches and rear ends and axles, that car turned this college boy into a car guy. I’ve spent the rest of my life wrenching on cars. I have to take exception, however, to touting the Buick Regals and GM as the sole pioneers in the area of American turbo cars. In 1981 I worked for a subsidiary of Ford Motor Company and had achieved the level to have an executive lease car three years earlier. My third lease car was an ’81 Mustang coupe with a V6 engine with a 7.5 lb. turbo boost. It wasn’t a breath taker at the stoplight, but it did perform like a SB V8. I’d chosen the turbocharged V6 because it was available in CA (where I live) with a 4 speed manual transmission and, in those days, I was more interested in shifting gears than I am now. The California V8 cars (a 302 2V) only came with an automatic. I left the company prior to the introduction of the Mustang SVT, or I would have had experience with one of those too.

    • Eddy Eckart says:

      Hi Ken,
      Indeed, Ford’s turbo debut on the Mustang in ’79 is noteworthy, and the SVO absolutely deserves its own article (stay tuned). Buick does deserve special recognition, though, for being the brand that got in early, made it work, and stuck with it for a decade.

      • Andy says:

        You mean almost like Chevrolet did with the Corvair from ’60-’69?

        Or how the Europeans did on almost every vehicle for much of the 70s (Along with K-Jetronic injection) before GM re-discovered it? I mean Renault was sticking them into pedestrian cars, and turning them into mid-engine rally tuned monsters, that still got 30 mpg. Down the street in Auburn Hills, Lee would stuff a 2.2 with a turbo into anything with four tires.

        C’mon. Buick did some great stuff, and built some gorgeous cars, but they didn’t even “pioneer” it within GM. That’s be a rear-engined Chevy, thanks.

        • Eddy Eckart says:

          All credit to the Olds Jetfire giving it a shot and the Corvair’s very limited but pioneering turbo run–not taking anything away from them. Heck, even the International Harvester Scout had a gasoline turbo engine briefly in the ’60s. I did mention the European brands that were already on the market when the turbo Regal debuted. Post-oil crisis though, factually, Buick got to market before the rest of Detroit (including Chrysler’s 2.2) and stuck with it while others either took a little longer, had hiccups before they got it right, or avoided it altogether. That doesn’t diminish any of the other cool early turbo engines out there.

    • Steve P says:

      Re Ken Sousa,
      I do not remember a 1981 V6 Mustang. I believe they were in line 6 engines then. And I sure do not remember a Mustang with a V6 turbo, ever. 4 cylinder turbo, yes.

      Maybe it was California only?

  • Paul Ipolito says:

    The Firebird will be ugly forever.

  • Gary Bechtold says:

    I love both cars. GNX’s are as rare as it gets to find at a car show these days. I stand a slightly better chance of seeing a Turbo TA.

  • paul s murray says:

    Andy has something of a point but lets be honest. most typical american drivers back in those days weren’t quite as concerned about maintenance as they are today. i doubt many, if any, dealerships were informing their customers about the need for on the dot oil changes, keep an eye on the temp gauge, and the problem with turbos coking etc. just the same as they wouldn’t give a lesson in differences between aluminum and old cast iron designs. if we’re looking for someone to thank for making turbocharging practical in road going machines then it’s all those old turbo diesel semis that came before. and i must give a reluctant tip of the hat to buick/menard for their apparently forgotten indy effort.

  • Sean W says:

    I love them both. I’ve owned a GN for over 20 years and now has a little over 30k miles on it. I’ve made modifications to the suspension and brakes where the handling is pretty decent now, interior is much better than most in that era – mostly soft touch materials and not too much hard plastic.

    I’ve been hunting for a TTA for a while now but their problem is, and the reason why I think values are restrained, is because they are really not very good cars. Every one I have driven has had significant rattles, squeaks, cowl shake, etc. Even very low mileage cars. No doubt made worse by the T-Tops but hardtop F-body’s are not much better. My GN is still very tight, much better than any F-body I’ve driven.

  • Tom S says:

    Great story! a lot of Valuable Info. I personally had a WE-4 Buick Regal 1987. ONE BAD MOMA JAMA ! !
    Complete Bad Out Package and was very very quick. I also have a 1985 Buick G N , hot air car. No inter -cooler; with a few tweeks to the turbo & exhaust & a chip it has a real strong life. 75 Years YOUNG, Bad to the Bone!

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