Spy Footage Shows Porsche 911 GT3 MR Testing

The latest version of the Porsche 911 GT3 MR from Manthey Racing has been spotted lapping the Nürburgring, and it is shaping up to be something special. For those unfamiliar, Manthey Racing is not just another tuning outfit. Think of it like the track-obsessed sibling in the Porsche family. It is not about more badges or plush upgrades. Manthey focuses on serious performance, especially for the race track.

What makes Manthey unique is that it builds performance kits that transform Porsche models into sharper, more focused machines. These are not full-blown car builds like you would get from Alpina or Mercedes-AMG. Instead, Manthey’s upgrades are offered as Porsche-approved accessories, allowing customers to pick and choose what fits their driving style.

In this latest prototype, the 992.2 GT3 is sporting some subtle yet aggressive tweaks. There is a new front bumper with a more pronounced splitter, and the hood vents look like they have been reworked—though currently covered, hinting at a potential cooling or aerodynamic function. Around back, the rear wheels are wrapped up in covers, which often signals a change in wheel design or braking hardware.

The rear wing is a big talking point. Manthey is sticking with a gooseneck-style mount like the one seen on the GT3 RS, but the final design details are still under wraps. Up top, there are likely vortex generators hidden beneath the camouflage on the roof’s trailing edge, designed to increase downforce efficiency without the aggressive look of RS strakes.

What really gives this car potential is the performance kit history. The previous 911 GT3 MR package included a new spoiler, updated rear wing, race-ready brake pads, improved brake lines, and a bespoke suspension setup with four-way adjustable dampers. That setup shaved the Nürburgring lap time to an impressive 6 minutes and 55 seconds.

Weight savings came from lighter wheels—20 inches at the front and 21 inches at the rear—which were 4 pounds lighter per wheel. Though the engine stayed the same, a naturally aspirated 4.0-liter flat-six pushing 502 horsepower, the reduced unsprung weight helped improve both handling and acceleration.

This new GT3 MR is expected to pick up right where the last one left off, with refined suspension tuning, enhanced aerodynamics, and possibly better brake hardware. It may not beat the GT3 RS’s 6 minutes and 49 seconds Nürburgring time, but it is certainly aiming to get close—and it might even humble the Ford Mustang GTD while it is at it.