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      02-12-2012, 09:50 PM   #2
BiG22DuBz
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Drives: X5M
Join Date: Nov 2011
Location: Sunny SoCal

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You can install any kind of downpipes to any exhaust. All downpipes connect to factory midpipes. All cat backs fit to factory exhaust pipes. Altering your factory cat convertors for straight Downpipes will void your warranty. BUT you will gain the most power and torque
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2014 M5...AMS downpipes, BMS tune, lead foot
2011 X5M....Downpipes, exhaust, dyno tuned
2008 Ducati 848....pearl white, Termignoni exhaust
CLS55 and C6Z06 (previous rides)