There not great at all, i had one go faulty and max itself out so boost went off the scale. Got that replaced, seemed to tune it for one boost channel, tune another channel go back to the first channel and it was boosting totally different to what I first setup. Didn't even bother using it on my new car, i got stabler boost with a mbc so stuck with that. If your set on getting an ebc go with a well known tried and tested jdm brand.