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Old 03-02-2013, 06:43 PM
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bear-avhistory bear-avhistory is offline
2014 435M-Sport/MPPK
Location: NC - USA
 
Join Date: Nov 2006
Posts: 2,088
Mein Auto: 2014 435M-Sport/MPPK
The only exhaust item that will make a noticeable power increase is down pipes. The mufflers have no meaningful effect on horsepower, maybe 5 to 8BHP at extreme top end. Knock that down by 15% for a dyno number.
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