Quote:
Originally Posted by supercati
I did this to my Euro 130i (E81).
Here in Europe we don't have the secondary cats, so I went resonator delete (modified the stock one) + 135i N54 muffler / backbox.
Sound is really really great. Pops/crackle when releasing throttle, plus louder sound when acceleration. Overall, it just sound louder and a little bit more agressive, and on the other hand, if you just cruise around in a normal way, is still acceptable, almost no drone at highway, etc.
If I were you, I'd definitely go for: secondary cats delete, resonator delete (modified or YPipe), 135i N54/N55 muffler.
You could also use 135i N55 resonator and modify it to be like the BMW Performance (easy), and it will be like an Y Pipe.
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The setup you mentioned is my favorite, it's one of the best sounds I've heard on this car. It's inexpensive as well; you can buy the Supersprint cat delete pipes and the Y pipe for the price of the BMW Performance muffler. And you can pick up a stock 135i muffler for $50. If you have a lift, you could probably do the install yourself as everything will fit together perfectly with only part of the pipe on the 135 muffler needing to be cut.