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Originally Posted by cody
http://www.scoobymods.com/forums/sho...09&postcount=8
If your DP is bare metal, consider wrapping that too. The DP radiates heat into the engine bay to a certain extent and holding the heat in exhaust components actually increases their performance (hotter gas travels faster).
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Close... you want to keep the heat in the exhaust before the turbo because the hotter the gasses, the more they expand, the faster the turbo spools. After the turbo, you just want to get them the hell out of there... keeping the temps up doesn't doesn't help that.
So, wrapping the DP isn't really going to gain you much, except to help reduce under-hood temps. The headers and UP on the other hand are a different matter.
Also remember, when wrapping stuff, there's pretty much a guarentee that somewhere down the road, condensation in the wrapping will eventually lead to rust destroying the wrapped exhaust. Even if you go the full 9 yards and use all the different sprays and sealants etc to make the wrapping "waterproof", you've still got a pretty good chance that the wrapping will ruin the exhaust in 5 or 6 years instead of 2 or 3. Plus, if you're going that route, it's probably cheaper and less work just to get everything jet coated.
Edit: Mike beat me to it!