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      12-24-2011, 08:51 PM   #52
Drives: '04 330i ZHP
Join Date: Dec 2007
Location: Chicago Burbs

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2004 BMW 330i ZHP  [4.75]
2011 135i  [3.73]
2008 328xi  [4.38]
Originally Posted by Beemw335 View Post
^ false
Reducing backpressure will affect low end power (low end torque) but will increase peak top end power (dyno numbers)

Ops car is reading really low imo
this is correxct. Without the tuning set to counter act the low end power drop you'll be sluggish under 3k rpms
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