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The stock exhaust already has a valve. There are several way to control it if you want. +1 on the catted DP. You'll get improved sound, volume, power and responsiveness.
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2017 M2|LBB|Manual|Executive Package|Fabspeed SportCat|Dinan S4 Tuner w Big Turbo|Remus Exhaust|Dinan Intake|Dinan Intercooler|Dinan LPFP Upgrade Kit|Ultimate Clutch Pedal|BMS Clutch Stop
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