change gearbox, rs1800 fiesta gearbox with the lsd or a s1 box and lsd, the car will pick up alot faster with better gearing and sprint alot better, hence making you think you have alot more power

the diesel gears are too long for a n/a zetec,

and direct too head thottle bodies, my personal favourite are AT power bodies, available from james goldstraw at grace engine developments at a good price