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      08-16-2012, 10:48 AM   #53
GTM_Challenge
 
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Drives: E92 M3,X5M,F30 335
Join Date: Jan 2010
Location: Chicago

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Newest video:

Challenge Sport catback Exhaust with Challenge downpipe with High Flow Cat. The downpipe added a good amount of grunt down low and in the midrange without adding any additional noise at crusing speeds. The cold start is now a bit louder than before and the over all exhaust note is a bit deeper with a hint of turbo noise in it When the Ecu is put in sport mode, you also get a bit more burble and poping noise off throttle


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