Blasting down the runway at the former U.S. Marines airbase at El Toro, it’s clear that the GMG GT3 RS goes a step beyond the standard issue. I’ve never found the current GT3 RS inadequate in any area, but this white 911’s suspension tweaks and spine-tingling exhaust howl are making a good thing even better.
That said, extra decibels aren’t always welcome. Out on the street, I find myself wishing this car’s sound output was about halfway between a stock GT3 RS and this setup. Maybe I’m getting old? One thing is certain, though: This car’s owner needn’t worry about extra decibels.
Proving gearheads come in all flavors, the owner of this modified 2011 GT3 RS happens to be a potato farmer in Idaho. “We built his 2007 GT2 to our WC spec, and he just loves it,” says GMG technical director Fabryce Kutyba. “With 15,000 acres of land in his backyard, this gentleman has the space not only to grow lots of potatoes, but also to build a 12-mile long, four-lane wide, private road on which he has clocked 213 mph in his GT2!”
Kutyba acknowledges Porsche’s second-gen 997 GT3 RS as being close to perfection. “Our goal is not to change what Porsche stands for, but to focus more sharply on the areas that our hardcore customers require for track-day work,” he says. “The knowledge that GMG gains in competition feeds back to the parts we offer in our road-car program.”
A stock GT3 RS boasts 450 bhp, which seems close to the 3.8 six’s developmental limit. Thus, I was surprised when Kutyba told me GMG’s tuning kit releases another 32 bhp — bringing the total to 482 — without internal engine modifications. He says torque is also up by 12 lb-ft, to 329 lb-ft. This is before any ECU re-mapping, says Kutyba, since GMG is working with chip tuner GIAC and expects a (slight) further gain. While we can’t confirm the claims, we can say that the 3.8 is still tractable enough to be driven around town in third gear.
The hardware changes begin with a new air filter that GMG says is worth a couple of extra horses, but the major contributor is the new stainless-steel exhaust with matched, equal-length headers, 200-cell catalytic converters, and new side mufflers. The system replaces the stock exhaust’s secondary muffler with a new center section, saving 10 pounds on a standard GT3 and five pounds on an RS (due to the latter’s titanium setup). GMG says the system adds 10–15 decibels at full cry, a substantial increase since stock GT3 RSs already exceed the sound limits at many race tracks.