I had no problems with my Fabspeed cat-by-pass pipe but I used Fabspeed muffler together. I also have the EVO with ECU update. My Boxster-S is clocking around 4.9 second for 0-60 without putting too much effort in to it (GTech).
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MetBlack-S
Factory side skirts
18" Sport Classic
B&M short shifter
IPD Cayman-S Plenum
80mm Throttle Body
FVD Sport Muffler
Fabspeed catbypass
EVO Intake
PSS9
Light flywheel and Sach stage II clutch
Front/Rear Strut Brace
Undetectable K40/3
Rear Defuser
Rear spoiler
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