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The auto(steptronic) transmission has the exact same Diverter valve that the manual does, I will note that the AUTO trans has a vaccum line routed to the intake that may make the sound less audible. FWIW I can hear my blow off quite well even when my intake was stock.
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16 M235xi 8ZF Black on Red FBO: Xhp trans tune -BMS Intake - VRSF Catless DownPipe - VRSF CP - VRSF Muffler delete/resonator - n22 plugs - MHD stage 2+ 95map - Wagner EVO II Preformace IC - Rear seat delete - weight reduction/stripping -FTP 18.5in rims - Hawk HPS front pads - StopTech STR 660 fluid  |