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      07-04-2014, 09:21 AM   #6
grantmax
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Drives: 2011 M3 ZCP
Join Date: Mar 2011
Location: LA

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This thread is confusing and severely lacking in commas. The title is misleading. Can we start again?

Test Pipes should make an appreciable difference in power. If you gutted the x-pipe while you were at it, better get an aftermarket muffler to clean up the sound.
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