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A cheaper immediate option is to eliminate the pin controlling the flap. I usually drive in comfort mode so I did this when I installed my MPE. Just use a pair of pliers to squeeze and pull it out, set the flap to open and wrap some picture wire around through the groove to keep it open. More noise and burbles in comfort, sounds great with BM3 base setting. Year and a half later it's still holding fine, cost was $2.
This is only a small step, others in here have the right answer, get yourself a down pipe and you'll be getting more power and drone free sound increase.
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328i RWD | MW on CRed Slick Top | 6MT | BM3 | MPE | GPlus FMIC | CSF Radiator | Millway Street Camber Plates & Monoballs | KW V2 6k/18k Swift Springs | F80 LCA/TS | SPL Bump Steer Kit | APEX SM-10 | R-S4 | DS2500 | RBF600 | SS Lines | Past: E36 328is & E38 740i
Last edited by MacklinUSOB; 10-07-2019 at 10:31 AM..
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