[smeard]

Originally Posted by chris_flies

To avoid creating yet another thread, can anyone confirm that the 135i Performance Exhaust Y-Pipe will be able to clamp onto the 128i mid-pipes? I'm being offered a unit at a very reasonable price, and it would be a perfect two-birds-with-one-stone ordeal for bolting up a stock 135i axle-back and doing a resonator delete.

I measured the O.D. of the 128i midpipes at right around 2 1/4" (erring low) and the seller measured the I.D. of the 135i Y-Pipe at right around 2 1/4" (erring high) as well. On paper, it should work, but I know that there are way more variables and too little information than necessary to confirm it. This would make this (imo) fantastic-sounding combo a bolt-on and super easy affair...

mine if I can recall correctly was 2 and 1/4 when I had mine straight piped. Should bolt up just fine, if not some creative welding should do the trick. If you want crazy backfires and burbles, go secondary cat delete as well!