There's absolutely no proof that UPREV makes more power or has more features compared to Ecutek. Infact, it's quite the opposite, as UPREV is very limited when compared to Ecutek and does not have any custom programming input.
Power is mostly dependent on the tuner and car, but based on the fastest 1/4 mile cars and highest HP Z's, it seems like Ecutek is on the majority of the high HP cars.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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