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Any muffler mod is for sound only... I wouldn't bet on any performance gains. Chip tune is a very easy way to get more power... nothing insane but give you a lot of pull at highway speeds.
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(Current) G12 750i X Drive / M-Sport / LOADED
(Current) 997 Turbo / 6MT / HRE FF01, Land Rover LR3 - Overlanding Family Adventure Shed, E60 525i - "family beater", Alfa Romeo Spyder Veloce - garage art
(Gone) F10 550i / M-Sport, D2 Audi S8, AP1 S2000, Z32 300zx, S13 240sx
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