The kit was designed for a stockish car. It was tested on a few cars, starting with fully stock (I think it dynoed around 215 whp low boost no intercooler fully stock car, then exhaust, and then higher boost pullies, intercoolers etc. and ended up safely around (250whp and 230wtq) If you can be reasonable with this kit as far as running CA91 gas (not forgetting and filling up on 87) and are running a non intercooled version there should be no issues with not enough fuel/detonating. The provided ecutec thingy is fine
I would agree with the rest of the people saying the powerband isn't crazy but with stickyish tires, nice suspension, and exhaust you quickly realize that the fun of these cars isn't always in a straight line but being able to power out of turns/powerslides etc.
The Innovate FRS always places high in the frs track competitions using the same kit they're selling with a decent driver.
Again, this kit isn't for high hp top end power, its for a low end to mid-top end torque range and it does that very well
Will it beat a corvette in a straight line? probably not, but it will be quicker then 70% of things out there for sure
Also everything above is my own opinion and experience