Quote:
Originally Posted by renfield90
The whole header. Might as well do it right and get the full benefit - the less excess heat in the engine bay the better.
In theory this also keeps the exhaust gases hotter, which helps them flow faster.
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I asked because JDL says to not wrap the whole header (not sure why) and I'd like to avoid issues down the road. I wrapped the OEM header on my RX-8 without issue so I guess it's fine