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I have the Challenge Street X-pipe with the Akra Slip-on. Sounds just right to me, not too loud but much better than 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.
Last edited by MJM; 06-04-2011 at 10:07 PM..
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