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thstone · 04-15-2019, 08:28 PM

10-15hp increase for the flash alone.

I got another 6-8 hp from a $300 catback muffler (and have the dyno tests to back it up) but only above 5000 rpm.

Any hp increase from intake mods (like air box) are debatable unless you go to a larger throttle body.

04-15-2019, 08:28 PM	#15
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	10-15hp increase for the flash alone. I got another 6-8 hp from a $300 catback muffler (and have the dyno tests to back it up) but only above 5000 rpm. Any hp increase from intake mods (like air box) are debatable unless you go to a larger throttle body. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor Last edited by thstone; 04-15-2019 at 08:36 PM.