Aftermarket complete cat backs - complete waste?

[///M42 sport]

the only bad thing about the IE fitment is the pipes are a little too close together. See the top flange spacing is closer than the bottom. This cause the ring seal to be loose and not airtight.

[BMW2ner]

does that wistle then?

[golde30]

the only bad thing about the IE fitment is the pipes are a little too close together. See the top flange spacing is closer than the bottom. This cause the ring seal to be loose and not airtight.

i didnt have this problem on my IE exhaust. but i did have another problem, and that was that the tailpipes hit the valence on the left side...this wouldnt be a problem on an early car, but on 88+ e30's(non-vert) it could be problematic. i had to have custom mounting brackets fabbed up.

Jon, wanna trade my IE for yer stromung? ;-)

[Spaz]

All the aftermarket systems that I've seen for E30s (most BMWs, in fact) are completely useless because they leave the piping size the same. That would be like getting an aftermarket header with the same piping size as the factory manifold.

but your forgetting that headers equalize the engine exhaut pulses where stock exhaust manifolds don't.
thats unless you have an m-series which has a stock header :P

[egk2]

Try to find a used prefab cat back, they're out there, I found my
Stebro catback used for $250. You can go with a universal muffler like magnaflow but they sound sloppy imo, while a Stromung or Stebro have a tuned sound.