Thread: Drone on CP-E Catback, with stealth Pipe & resonators.
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      02-20-2014, 10:02 PM   #3
Freon
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Drives: 2009 135i
Join Date: Nov 2007
Location: Indianapolis

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It's unlikely the tunes do anything at all at idle/cruise load levels...
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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