fuel cut, cuts the fuel. thus, stopping the car revving up, but the caveat is also a lean burn for a split second. its a pikey way of stopping it revving up. ignition cutting is better but it produces mc flames (that all a bee*r is/does) so you cant really have that on a stock car. unless youre sitting there bashing it off of fuel cut constantly nothing bad will happen. hitting it once and using that as a warning is the best way to go about it. at the end of the day, its there to stop you damaging the engine, if it was really going to borg the engine, it wouldnt be there/would be let lower, etc. alternativly, get your car setup properly so it doesnt hit fuel cut yes? ^^;