I am no expert but I am sure I heard that putting a fmic on a car under 400bhp is a waste of time as it just causes lag but I am sure one of the gurus will be on and correct me if I am wrong. To get close to the 300bhp you need on top of what you have done uprated fuel pump and a remap you should see around the 280bhp bigger injectors and uprated turbo will see you hit just over the 300bhp with a remap personally I wouldnt want much more than that on standard UK internals but up to you as for the clutch don't have a Scooby what one lol.