hi there. how much difference does heat wrapping your manifold and downpipe make? also how much would i need to buy to wrap an unequal length header and decat downpipe(dont want to buy too much lol)

 

The main reason to wrap the headers, up-pipe and downpipe is to reduce engine bay temperatures therefore allowing a denser charge of air into the engine. If I remember rightly DEI's website has instructions for fitting. This includes a formula for calculating the amount of wrap needed.

 

sorry for being dumb, not heard of DEI. whats there web site please.