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Old 11-01-2011, 06:48 PM
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Yorgi Yorgi is offline
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Location: Toronto
 
Join Date: Mar 2005
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Mein Auto: '04 M3 / '06 650i Cab
Using a larger diameter pipe will be fine, just make sure you use a proper coupler where the 2.25" meets the 2.5" pipe.

A larger pipe tends to give you increased flow with slightly better HP at high RPM but sometimes a little less mid-range torque due to the loss of back pressure.

I think the Magnaflow full cat-back system uses 2.5" pipe.
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'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
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