I'm very happy with it. In terms of affecting the cars outright performance, as such, I cant really say till I've been on the track, strip or Dyno with it - but Ill eat my hat if the car isn't measurably quicker in all situations. On a fast back road run for 150 miles it felts quicker for sure but... read more
Mark, Australia 991 GT3 Race Headers
GT3 Muffler Adapter Kit for 981
GT3 Muffler for 981 Chassis Cayman and Boxster
Click on a photo to enlarge.
Our GT3 Muffler Adapter kit comes with everything you need to mount a GT3 muffler on your GT4 except the muffler and tips!
The kit is made with 2.5" 321 Stainless Steel for a lifetime of trouble free use. We include 2.5" valves to eliminate drone by keeping the flow going to the upper path of the GT3 muffler when cruising and switching open to allow for more power!
Our kit is unique in that you can add optional 200 CPSI catalytic converters that convert race headered cars to catted cars. This is a better place for cats as the race headers can make the power and then the cats can do the conversion with only a very small HP penalty (3-4 whp in our testing).
The GT3 Muffler adapter is used in our popular D4 (stage 4) GT4 power kit, and fits all 981 chassis cars!
- 2.5" 321 Stainless over axle pipes
- 2.5" Valves
- GT3 Muffler Bracket
- GT3 Muffler Straps
- Optional 200 CPSI cats