I put 4.6iS mufflers on my 3.0i a few years ago, and they won't make any difference in noise. I would like to do a resonator delete/X pipe as well someday, but it's low on the priority list. The 4.6iS mufflers do look a LOT better though.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau