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135i axelback. It and catless headers make a great sound. OR if you want so spend more (a lot more, as a 135i muffler goes for $100) you can go with the Supersprint muffler, which has a great sound paired with the headers
I've heard both these combos in person. Headers with a Supersprint muffler is quieter than headers with a 135i muffler.
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