Id speak to Richard @ FB Tuning (link below) and get a cost for a remap, uprated walbro 255 fuel pump around £100 (speak to Alyn @ AS Performance), class 7 NKG plugs are about £35-40 (AS Performance), K&N Panel filter around £50 (AS Performance) so with that you could spend around £700-£750 and have a very well running car with decent horsepower.
