Improve the sound and performance of your 981 Boxster or Cayman with our GT3-style muffler adapter. In stock form, the 981 exhaust cannot handle the thermal load of a modified 3.8L GT4 engine, and can have big problems with heat-soak resulting in high oil and coolant temperatures. The larger 2.5" tubing helps evacuate the exhaust gases to reduce heat soak and improve the performance of your engine while also providing a great sound upgrade!
With options to add sport catalytic converters and valves, you can add your choice of GT3-style muffler to round this package out. Whether it's a stock 997/991 GT3/RS center muffler, or a Dundon Lifetime Loud or Quiet muffler, this kit is compatible with all of them. Please reach out if you have specific fitment questions.
The kit is made with 2.5" 321 Stainless Steel for a lifetime of trouble free use.
Pair with our GT4 Clubsport Headers and a 991 GT3 Muffler for a complete exhaust upgrade.
- 2.5" 321 Stainless over axle pipes
- GT3 Muffler Bracket & adapter
- GT3 Muffler Straps
- All necessary hardware
- Optional high flow catalytic converters
- Optional valve sections (to retain Sport Exhaust functionality)