Exhaust System with Valves, 981 Cayman GT4 with 200 Cell "HD" Cats

The perfect compromise for you and your loved ones. Rich, deep race car tones with the valves open and soft subtle, completely stock sounds with them closed.

• 25 Hp & + 20 Tq Gain.

• 200 cell HJS “HD” Sport Catalysts.
• 25 lb. weight savings over OEM system (Weighs 59 lbs. (27,0 Kg), OEM weighs 84 lbs. (38Kg).
• 2” primaries to 2 ¾” collector / piping.
• 2 1/2" Tubing (63.5 mm).
• 2 x 3.5"(90 mm) Round Tips.
• Motorsport merge collector.
• Intoxicating growl at idle, partial throttle and wide open throttle with the valves open. Quiet with them closed!
• German V2A - X5CrNi18-10 - 1.4301 stainless steel for improved durability.
• Minimal Resonance / Drone in the cabin compared to the competitions full exhaust systems.
• “Aero Quip” style motorsport muffler connections with a single gasket and flange at the header to ensure a leak free exhaust.
• Does NOT interfere with emissions and will NOT trigger the check engine light.
• ECU programming (software) is NOT NECESSARY.

Please note this exhaust system is a direct replacement for the 981 Cayman GT4 with the Porsche Sport Exhaust option.

Want more detailed information on how our mufflers are unparalleled in the aftermarket? Simply open up our additional .PDF file.

Our entire “Brombacher” line of exhausts is manufactured to our specifications by M&M Exhaust, GmbH in Germany as is this system for the 981. The benefits of this system are 3 fold, you can pass emissions with ease, you can choose between the stock sound or louder with a touch of a button and you don’t need to run a software file (for those who are concerned about warranty).

But we didn’t stop there; our system also makes substantial power minimal drone!! We noted a + 25 crank hp & + 20 crank torque gain, predominantly in the mid and top end. The increase in mass and velocity of exhaust flow through the specially built muffler internals produces a strong, linear; firing-order dominated true flat-6 Porsche sound.

This system retains the factory vacuum lines so that you can select the sound you want. It is factory quiet with the valves closed and far more aggressive with deep, rich tones with the valves open.

In addition, each of our exhaust products have been extensively tested on both a chassis and engine dyno as well as logged thousands of miles on both the street and at the track. All this research, development and testing ensures maximum horsepower gains throughout a broad power band; all while maintaining reasonable sound levels for the street and provide a distinct, sporty exhaust note that is purely Porsche.