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      10-20-2019, 02:09 PM   #3
Mikey77T
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Drives: 325i
Join Date: Oct 2019
Location: Norwich

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Thanks for the reply,

So apart from the noise etc, am i correct thinking the performance muffler is a straight through?

Just trying to see why BMW would make our mufflers so restrictive? is it purely for noise pollution or does the restriction also create pressure etc. to help with power/torque?

And if it is for power/torque, why would they make the performance one straight through!

My point being is either the restrictive one is good or the performance muffler! or neither of them actually make that much of a difference on power/torque and are just for less or more noise!
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