I have rapped my manifold and down pipe to keep the under hood temps down. it does make your pipes look like shit because it melts to the pipes. wouldn't do it on a everyday car that sees water or wanything like that because of holding water. never heard of it voiding warnety but maybe it has. but still don't see a reason of doing it on a quad it is all open and gets a lot of air when riden. but i been seeing a lot of street bikes with turboson them and they have there pipes rapped. i wouldn't do it on a quad but a car/truck i would. hope this helps you out any.