turbotoaster wrote:
would the 100i be best as i havent got alot of money to spend i just want a basic 50bhp wet shot of nos on a button
The 100i would be the kit for you, you should also seriously consider getting a progressive controller if your funds allow, particularly in a high powered FWD car.
A system jetted for 50bhp will give you more than 50bhp gain on a turbo motor, anything up to 100+bhp gain is possible, this is due to the nitrous super cooling your inlet charge. Depending on how much you/your motor can handle you could stick with a 50bhp kit and get the extra 'free' bhp or go down on the jetting so the total gain is 50bhp and save on the nitrous.
Also having the system activated by button is not the best setup to run. The best setup is to have it activated at WOT. This is for several reasons, you can't accidentally activate it before WOT, if you need to back of quickly you just let off the throttle and its cuts the nitrous too and you don’t have to think about pushing a button, which in the heat of the moment can be useful.