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If you plan on going over 480whp (roughly 18-19psi) at redline (this usually requires E85) then you will need an M4 flywheel and SSP clutch packs.
My honest opinion. Ditch JB4+BEF and go flash only with Wedge Performance. Smoother, faster, more consistent, 10000x easier to dial the car in. If you want to run meth get an external controller. Single CM5 nozzle is fine. Ken himself has a PS2 135i and spent a lot of time developing the platform, also Houtan & Sbrach (forum members) tune for Wedge and both have 135i's with PS2 turbos/ know these cars inside and out.
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2006 Z4 M Roadster Black/Imola Red, FBO VF-Engineering, e85 Flex Fuel-Sold
2012 BMW 135i N55 DCT Alpine White/Coral Red, FBO, TBI, Full e85, JB4 BEF-Sold
2006 Z4 M Roadster Black/Black-Sold
2021 M2 Competition DCT Hockenheim Silver
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