I think the trd one is the best as they are designed for the moter and tested, after looking around they also seem to hold up to there expected gain in KW/horsepower. Im sure they all will deliver a gain in power but again its when the power comes on and I tell you I was back in my seat after I installed it, my car flys, before at 2500 it was a little slow and now thats when the power really comes on and again when the 6000rpm hits she kicks in full & hits the rev limiter before you know it.... And it looks good with the TRD logo keeping the car all TRD....