Quote:
Originally Posted by Asbjorn
The left exhaust is significantly quieter than the right on the 35i. It is really noticeable after you remove a set of cats. I would assume simply replacing the left muffler with the 35is version would help a lot. You can also cut open the 35i muffler and remove some of the dampening material inside.
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Now that you mentioned it, I wouldn't be surprised if the 35i and 35is had the same muffler, just different packing (dampening) material inside.
If I'm not mistaken, this is the case for the 335i vs. 335is in the E9x