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First off, note that the 23i is a euro spec model and if you wanted the less powerful engine in a used car, you'd be getting the 30i (NA inline 6). If new, it would be the 28i (twin turbo 4 banger)
There are several aftermarket exhausts with different tailpipes configs, but it seems Eisenmann is the most popular (and expensive). They make dual (left and right) and quad exhaust systems. You can get a new diffuser, but some have had a shop carve out the space for additional tailpipes. If they're good, the results can be acceptable, but I would really want to be confident in the tech's work. check in the classified ads section of this forum. there are often members selling used or new exhausts.
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2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.
2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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