hi all, im just after abit of advice really

i want to get abit more power from my st170, i no that air filters, decats etc etc arent to great for power increases on it, so im wondering about throttle bodies but have no idea were to start, so i have a few questions,

were would i start and what would i need, e.g. what componants are required to run them.

what sort of gains would i expect from them.

and how much roughly would i have to spend on them

wilst im at it, what sort of price and gain would i get from a one shot remap

advice is greatly appreciated

thanks