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06-04-2011, 04:02 AM
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#18
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First Lieutenant 
Drives: Sparkling Graphite E92 M3
Join Date: May 2010
Location: Indonesia/San Francisco
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Quote:
Originally Posted by MJM
I have the Challenge Street X-pipe with the Akra Slip-on. Sounds just right to me, not too loud be much better that the Slip-on alone and better that the stock exhaust. No drone due to the resonators in their design. Also no concerns about passing vehicle inspection where I live.
They claim 10 wheel hp and 15 ft tq gains although I haven't dyno'ed to verify.
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do you feel the power?
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