A guy in this thread is rather adamant that 325/330 PE is the same http://www.e90post.com/forums/showth...rmance+exhaust
Anything up to 2.5" for a NA 2.5L motor is fine.
I believe the Canadian vehicles share more in common with US spec cars rather than Euro cars. The part number for the US PE ends in 79, whereas the Euro spec PE ends in 80.
John for performance gains I imagine the ideal setup would be:
- no cats (but for legality sake high-flow cats that are ADR approved)
- 2.5" piping throughout
- material that is lighter than stock (not hard as the OEM muffler is very heavy)