Thread: Exhaust Mods
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      11-08-2010, 06:36 AM   #3
Mr 7
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Drives: 2009 650i, 2011 550i
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Quote:
Originally Posted by johnbmw6 View Post
I would check the "flap-valve" on the original exhaust, and find out if it affects back pressure and how/what they do to get round it, sometimes changing the exhaust with this on it to removing it LOWERS bottom end torque, just check this first. However some people say it "Increases it".
Sorry for being technically ignorant about this but how exactly would you do this and does it dramatically decrease performance ?
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