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Old 03-13-2017, 08:18 AM   #14
thstone
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,517
I dyno tested this cat back exhaust and the actual increase is 7hp at the very top end (no additional power in the low or mid-range).

http://986forum.com/forums/general-discussions/51783-top-speed-pro-1-catback-exhaust-hp-increase.html
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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