Quote:
Originally Posted by ArmnStig
I was wondering if a G20 3 series M performance exhaust would fit a G29 Z4? The engines are the same however I am unsure if the length of the exhaust itself would fit. Its upsetting that BMW doesn't really have any parts in regards to M performance for the new Z4.
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To get back on topic, no, the m340i exhaust is longer and will not line up with the Z4. Even though they share the same engine, the exhaust pipe routing is different.
Not saying it can't be modified to fit, it wouldn't be as easy as adjusting clamps. Pipes would need to be cut/bent/flared/fitted to adjust the input pipe, as well as the tail pipe locations so they line up with the rear fascia. By the time you buy the MPerformance exhaust and having it modded and fitted (plus the time to do all that), you'd be better off buying one of the ones already fitted for the Z4.
If you're looking to convert to a quad pipe exhaust instead of the trapezoid looking ones, you can save a ton of money and have a reputable exhaust shop chop the rear tail pipes off the exhaust and add a quad tip layout. They can even eliminate the exhaust valve doing this (or include it if you prefer) and it'd be maybe a few hundred at most (not the $2k+ of these pre-made ones). Benefit of this is that the exhaust stays welded throughout and you won't have an exhaust leak anywhere (slip on exhausts are notorious for this.
Like someone else mentioned, the exhaust is already a "performance exhaust," but if you're looking to get louder or a different note, try what others have suggested.
1) Put the car in sport mode and unplug the exhaust valve.
2) Change the downpipe to a sport cat (or catless if you don't mind the exhaust smell).
3) Have an exhaust shop remove the middle silencer(s) from the midpipe.
4) Buy an axle-back exhaust (you'll have to cut the muffle from the midpipe with a saws-all). Have an exhaust shop weld it up after.
5) Buy a full cat-back kit. Have an exhaust shop weld it up after.
2+3 can be interchanged as they cost similarly. But the above range from cheapest to most expensive. The weld up is a suggestion as exhaust leaks will make the exhaust have a hiss that doesn't sound "good"