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Mmmmmm, turbo spool..... So how about some details? What did you guys do to it? Change muffler, delete muffler?
How loud is it inside the car whild cruising/accelerating?
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2013 F30 335i ///M-Sport
Forgestar/Challenge/BMS JB4
Wagner/Evo Race/M-Performance
2016 F15 50i ///M-Sport
BM3/H&R/Borla
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