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If you want a large change in sound try new downpipes, mine are catless and with the tune it screams through tunnels and under acceleration but doesn't drone with the stock msport mufflers. It was less than 2k which is less than many Dinan or other exhaust systems and I got a ton of HP/TQ.
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Jonathan Russell-
2016 F06 650i GC
Mods: dps & dyno tune
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