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CMS HP Exhaust Center Section for Porsche 991 GT3/GT3RS

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CMS HP Center Delete


Engineered to deliver the ultimate in sound, power, aesthetics, and quality

Check out videos of the CMS exhaust in action below!

Designed and built in the U.S. from heavy-gauge four-inch diameter American T304 stainless steel, meticulously TIG welded by hand, the CMS HP Exhaust Center Section replaces your heavy, restrictive OEM center muffler. The unique design increases exhaust gas velocity and flow capacity, adding over 11 horsepower and 11 lbs-ft of torque at the wheels (and removing 10+ lbs. of rear end weight).

Perhaps best of all, it unleashes an incredible engine snarl at low to mid revs that turns into an intoxicating all-out flat six wail above 6,000 RPM! The CMS HP Center Section makes driving the 991 GT3 and GT3RS the exhilarating experience it was meant to be. There's no drone anywhere in the RPM range: part throttle, full throttle, idle, no drone.

We engineered the infinity-collector outlet using the same functional design principle used in racing header collectors. Each exhaust pulse creates a vacuum in the outlet; the next pulse meets that vacuum and increases in velocity, leaving a vacuum, and so on. This scavenging effect increases gas velocity, flow capacity, and ultimately power. The harmonic effect creates that incredible sound!

This form-follows-function design also allowed us to relax the radius on each curved outlet pipe, further improving flow. The sonic properties of the naturally scavenged exhaust pulses eliminate the need for a power-robbing cross pipe others use to try to tame drone. Instead, the CMS HP Exhaust makes power and sounds incredible across the rev range.

Each exhaust is meticulously crafted by hand from the highest-quality 304 stainless steel, the result of our unwavering focus on workmanship, design, and premium materials. The CMS HP Exhaust is available either in a natural brushed stainless steel finish or with a high-temp satin black 2000°F ceramic coating.

As always, we only sell products that stand up to our punishment on the street and at the track. If we don't use it, we don't sell it!  With that in mind, the CMS HP Exhaust is backed by our Love It Or Leave It Guarantee: install it, drive it, if you don't love it send it back to us for a full refund.*


  • 991 GT3 (2014-2016)
  • 991.2 GT3 (2018)
  • 991 GT3RS (2016+)
  • 911 R (2016+)


  • Designed and manufactured in the USA using premium American T304 stainless steel
  • Meticulously TIG welded for the ultimate in quality, performance, durability, and appearance
  • Engineered infinity collector outlet for superior flow, performance, and sound
  • Relaxed-radius four-inch diameter outlet pipes
  • Your choice of standard brushed stainless steel finish or optional satin black 2000°F ceramic coating
  • Premium AccuSeal exhaust clamps included





* Guarantee is applicable for 30 days after receipt of exhaust. Exhaust must be returned in good condition -- notwithstanding normal wear from installation and initial use -- with all original parts, clamps, fasteners, etc. Buyer must pay for return shipping.

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