The Four-Door Muscle Car That Made Sports Cars Look Overrated

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Saturday, 4 Jul 2026 10:00 0 1 autotech

The Four-Door Muscle Car That Made Sports Cars Look Overrated

In the 2000s muscle cars were all but extinct, with many manufacturers giving up on the genre altogether. There were a number of factors that had worked against the classic America V8 sports car in the decades before, and many people must have thought that it was gone for good. But while techy coupes and lightweight sports cars from Japan and Europe were very much the flavor of the day, who would have thought that a four-door muscle car would come out of nowhere and make them seem rather pointless. This V8 sedan was the last hurrah for a manufacturer that would sadly disappear for good shortly after — but, boy, was it a good way to go out.

Table of Contents

The Muscle Car Took A Hiatus After The ’70s

1964 Pontiac GTO

Mecum

Buyers Turned To Coupes And Sports Cars For Thrills

Front close-up shot of the 2004 Porsche Boxster S 550 Anniversary Edition 6-Speed

No one realized it in the freewheeling ’60s, but driving a car that needed a tank of fuel to go and buy a bottle of milk wasn’t such a great idea when gas got pricey. There were soaring insurance premiums too, not to mention clever imports that matched muscle car styling with frugality, and by the ’80s there were barely any powerful V8 coupes left. During the ’90s, a few cars like the Impala SS gave unexpected muscle car memories, but generally people were more interested in whizzy coupes than eight cylinders.

The Pontiac Nobody Expected Was Faster Than A Mustang

Pontiac’s final performance car carried a Corvette engine and left the Mustang GT standing. Barely anyone noticed before the brand was gone.

The Pontiac G8 GXP Wasn’t Messing Around

The death of the muscle car must have been harder for Pontiac than a lot of manufacturers. Pontiac was always the racier division of GM, and while the company soldiered on with the Firebird, you couldn’t help but think it was a bit lost in the ’90s. What Pontiac needed was a bit of rebranding. Bob Lutz was brought in by GM to help get Pontiac’s swagger back. The obvious starting point was to bring back the GTO, the car that had kicked off the whole muscle car craze in the ’60s. This would be based on the Australian-market Holden Monaro and was the fastest American muscle car of the 2000s.

There were some other quirky models such as the Solstice, but a key piece of the Pontiac renaissance puzzle was to have a flagship rear-drive sports sedan that would be an affordable take on the likes of BMW and Mercedes. Turning Down Under again, Pontiac used the Commodore VE performance sedan as the basis. To show it was serious, Pontiac introduced the 2009 GXP version, designed to take aim at the M-Division and AMG. This was fitted with an all-aluminum 6.2-liter LS3 V8, and it wasn’t messing around…

The GXP Was A Firebreathing Four-Door

Engine	Power	Torque	0-60 mph
6.2-liter LS3 V8	415 hp	415 lb-ft	4.7 seconds

Source: Pontiac/ Independent Tests

On paper, the G8 GXP had everything it needed to take on the BMW M3 and put Pontiac in a brave new direction. The LS3 made 415 horsepower and 415 lb-ft of torque, enough to send it to 60 mph in 4.7 seconds, with the quarter mile demolished in a shade over 13 seconds. This was the same as a manual M5. Power in the GXP was sent through either a Tremec TR-6060 six-speed manual transmission or a 6L80-E auto.

The suspension had been tuned at the Nürburgring, and stopping power came from Brembo ventilated four-wheel disc brakes with four-piston front calipers. The cabin was updated nicely to give it more of a sporting edge and reviewers called it a four-door Corvette. High praise indeed. But it wasn’t just Euro sports sedans that should have worried, even sports cars suddenly seemed a bit pointless.

SLP Built A Wilder And Far Rarer Version

Front 3/4 view of a 2009 Pontiac G8 GXP SLP Firehawk parked

Pontiac fans will remember Street Legal Performance (SLP). The legendary aftermarket manufacturer and tuning house worked with Pontiac on various projects in the 1990s, resulting in several high-performance versions of the Firebird known as SLP Firehawk. When Pontiac unveiled the G8, SLP saw it as the perfect platform to revive the Firehawk nameplate.

SLP worked its magic on the G8 GT and GXP, bolting on a TVS 1900 Series supercharger, a cold-air intake, and a custom exhaust. The result was a power bump to 500 hp for the G8 GT and around 550–600 hp on the GXP models. With a 0 to 60 mph of just 4.3 seconds, these SLP-tuned G8s could leave bona fide sports cars in the dust. But because Pontiac was axed by GM shortly after, only 34 official SLP G8 Firehawks were ever built, including just 9 GXP versions.

These Four Door Muscle Cars Prove Going Fast Is Better With Friends

Not a fan of four-door muscle cars? You’re wrong. Here are ten killer cars that have all of the best equipment and enough doors for the crew.

How The G8 GXP Made Sports Cars Seem Irrelevant

Imagine this: in 2009, a Porsche 911 Carrera cost $76,395. That car can hit 60 mph in 4.2 seconds and cover the quarter mile in 12.5 seconds. The G8 GXP of that year, however, cost just $39,995, or almost half the price, and it was just half a second slower. Not only were you saving almost $40K, the GXP had acres of space, a nice comfy spec, and a ton of practicality. To put it another way, the GXP was only four grand more than a 2009 BMW 135i. The $36,675 Beemer was a tad slower to 60 mph and made do with a 300-hp inline-6. A $52,475 2009 BMW Z4 sDrive35i was slower too, as was a $48,325 2009 Audi TTS.

The G8 GXP Had All The Makings Of A Giant Slayer

There was pretty much nothing around 2009 that could contest the G8 GXP when it came to price and performance. But it wasn’t enough to save Pontiac. The 2008 crash spelled the end for Pontiac and the GXP was a victim of bad timing. While Pontiac sold 37,000 of the standard G8, just 1,829 of them were GXPs. The GXP has ended up being one of the rarest mainstream muscle car models of recent times and a glimpse at what could have been for Pontiac. These days, coupes are nowhere near as popular as they once were, often made irrelevant by fast four-doors and SUVs. In that way, the GXP was ahead of its time.

The G8 GXP Couldn’t Save Pontiac, But Its Legacy Lived On

Front 3/4 view of a 2009 Pontiac G8 GXP parked

By the time the standard G8 made its way over from Australia, which was about a year before the GXP’s debut, the writing was pretty much on the wall for Pontiac. The beloved brand had been profoundly unprofitable for years after losing its performance identity, and high-profile failures involving the unsightly Aztek and a failed GTO revival had further ruined its reputation. The final nail in the coffin came in 2008 when the financial crisis hit, forcing a broke GM to seek assistance from the U.S. government to survive.

As part of a multi-billion-dollar bailout deal, the government forced GM to slash its brand portfolio from eight brands to four core brands. As much as enthusiasts wanted Pontiac to be one of them, GM ended up choosing to keep Buick instead, which was an absolute juggernaut in China at the time. As great as the G8 GXP was, it couldn’t erase decades of brand dilution.

The Chevrolet SS Was Its Spiritual Successor

Engine	Power	Torque	0-60 MPH
6.2-liter LS3 V-8	415 hp	415 lb-ft	4.5 to 4.7 seconds

The G8 GXP ended up being such a great swan song model for the arrowhead brand that some GM insiders couldn’t let it go. Bob Lutz, the man responsible for the G8 in the first place, fought hard to save the G8 under a different banner. Lutz’ efforts culminated in the 2014 Chevrolet SS, which is widely regarded as the G8 GXP’s spiritual successor.

Like the G8 GXP, the Chevy SS was based on the Holden Commodore, though the SS stepped up to the updated VF-generation platform. Every single Chevy SS was powered by a Corvette-sourced LS3 V8 cranking out 415 hp and 415 lb-ft of torque, but you’d never tell just by looking at it. Other performance goodies like GM’s world-class Magnetic Ride Control suspension, Brembo brakes all-round, and a Tremec six-speed manual transmission. The SS was a proper G8 GXP successor, but it also had a short life from 2014 until 2017, when GM closed down its entire Australian Holden manufacturing operations.

The Last True Pontiac Muscle Car Is Now a Bargain

Just before Pontiac folded, the brand made one last epic muscle car – their fastest one ever.

The GXP Is A Four-Door Corvette On The Cheap In 2026

Despite its rarity, the G8 GXP is something of a performance bargain these days. Hagerty puts the price of good condition GXPs at $25,200 in 2026. But that might not tell the whole story. Recently, a 108-mile 2009 Pontiac G8 GXP 6-Speed sold for $61,614 on Bringatrailer, while other cars have gone for closer to the $30,000 mark. There are also cheaper G8 GXPs to be had if you can handle higher mileages. With Pontiac not looking like it will be coming back soon, the GXP remains a last hurrah for the company. But rather than the car representing a dismal end for the company, it remains one of the most exciting models of recent times. Who said you need a sports car to have fun?