Remaps are gash. Ok, if your going to chuck serious money at modding then fine, you will get results. Kevs car is a hooligan even when its running like a bag of spanners!
Go to a mod shop with a few hundred dabs in your pocket and ask for a map then you are wasting your time and money imo.
Id much rather spend that dosh on brakes and or tyres.
Or just buy a faster/more tuneable car? That's what I'm gonna do.