the exhaust housing can be wrapped as well as the down pipe and wastegate dump pipe. nothing needs to be wrapped, wrapping them just keep the engine bay a little cooler
The hotter you keep the exhaust housing and downpipe (to a point) the quicker spool you will have. I noticed a huge difference between having the turbo wrapped and not wrapped... unfortunatly my wrap caught on fire ... so after I put it out I pulled it off completely.
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