Yeah i must say there's quite a few things you can do to the potato, your better off getting the carbon shielded air filter job though best part of £150. I've just fitted the denzo sparkys and with 9mm iridium leads performance has improved, Tip Have the cat and silencer out, yes it's noisey but i found it was so much better to run, atm i'm running @ 23.5mpg, just something to look out for when you do that. I'm getting the OBX exhaust (iminent) order from america, save yourself £40.