as ghostek said the exhausts are the same between the touring, saloon, coupe and convert
you will need the catalytic converter and the back box, the manifolds are the same as the 328i ones so there is no need to change them
when you buy the M50 inlet manifold make sure you get the right one (2.5) I've heard of unscruplous characters passing off the 2.0 ones as the 2.5 manifolds, the 2.0 ones are just the same as the 328i manifolds
I part exchanged my 323i for a 328i and only payed 100£ cash on top!
Might be worth trying this
Also this might help for what you need to swap them
Just look for a 328 cat and either a 328 stock back box(loads crop up on ebay) or after market 328i/325 back box,
When I did mine I also got these bits as well, to make life easier in case of snapping bolts etc. for longevity aswell, plus when you get the exhaust it will probably not have everything you need to fit it.
2x gaskets Cat-Manifold (#10 part 18301716888)
6x Hex bolt Cat-Manifold (#3 part 11621427586) "Could reuse if prefer"
6x Hex Nut Cat-Manifold (#11 part 18301737774) "Could reuse if prefer"
1x Flange (#10 part 18111719444)
1x Clamp upper Cat (#4 part 18101433249) "possibly will come already on Cat"
1x Clamp lower Cat (#5 part 18101433250) "possibly will come already
1x Hex bolt Cat (#6 part 07119904533) "possibly will come already on Cat"
4x Hex bolt Cat-Backbox (#8 part 07119912524)
4x Hex Nut Cat-Backbox (#9 part 11621744323)
1x gasket ring Cat-Backbox (#10 part 18111723720)
1x gasket ring Cat-Backbox (#11 part 18111719446)
Maybe check the exhaust hangers for damage
and replace accordingly
i got ripped off for my M50 manifold the other day. I looked at it when i had it at home and saw the "2,0" on the part number. So i went and bought a real one with "2,5" on it, took th other one back, tought the fella a lesson and got my money back! haha
they look similar when you havent got the other one next to it to compare it!
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