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Both are great platforms. I am very happy with MHD. I had JB4 and back end flash, but the drivability was too rough. The mhd flash, the car behaves more like oem.
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Convertible | Manual  | M-Sport | MHD Stage 1 + FMIC | 335is Clutch | ER CP | RB Inlets | VRSF 5" Stepped FMIC | M3 F/R Control Arms | KW V3 | Hawk HPS Pads | Stoptech Slotted Rotors | Blackvue DR650-2CH Dash Cam | LCI Taillights |