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ECUTek is no joke, switched from BM3 in March and I haven't looked back since. First revision was better than BM3 with regards to throttle closures and consistency of power (BM3 could get to a state where boost would never catch up at high RPMs).
I'm only on the second revision which unlocked a bit more mid-range power as well as up top, and this X3 is a missile now. Incredible that I'm still very conservatively tuned for 91 and there's a ton of headroom, but the car is pretty well dialed in for canyon driving.
I will say that ECUTek is a bit late to the game on N55 stuff, so they have some R&D goodies to catch up to. If you have a chance to get on the platform, please do. It will help many other users who do the same.
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Current mods
Rockford Fosgate P3 // JBL MS-A5001 // MiniDSP
Ultra Racing Strut Brace // AFe Pro Dry S // PS2 // Custom Inlet // DV+ // FTP Boost Pipes // VRSF Race IC // VRSF Downpipe // ECUTek Protune @ 5280'
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