Too many long posts here for me to read so idk if it was suggested, but you could get an LSD and gear ratio change. That'll give 40 or more hp from what I've been reading, depending on the ratio you choose.
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2006 JB 330i/ZPP/ZSP/I-Drive/Heated Seats/L7/Blacklines/19" Gunmetal V710's on Vredestein Ultrac Sessantas/BMS PBX/Red MFD Scoops/Matte black grilles/Matte black Amber Gone 2.0s/BSW center midrange speaker/35% tint/Black and white roundels
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