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      02-04-2013, 08:18 PM   #9
ade146
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United Kingdom
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Drives: E90 330d sport auto
Join Date: Sep 2012
Location: S.Wales or Cheshire

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Back pressure is a myth imho although you can change characteristics with exhausts. The tuned length has more of an effect on noise than performance. The manifold lengths are important for power. If someone does know how the back pressure myth started it would be interesting.