This is something I've considered too, as I don't live in a state with smog testing. How much did they run you? I can't find the ebay seller. They do look pretty good though. I already have a set of 4.6iS mufflers on my car, but they didn't make any difference for the sound, which was kind of disappointing.

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