You don't wrap cast iron manifolds or they will crack, the wrap retains too much heat.Quote:
Originally Posted by 130man
Manifolds and turbos are wrapped on some race cars to minimise lag.
Wrapping headers is OK, I ran wrapped mild steel extractors/headers on a race car but I used to run 0W-5 oil too and I wouldn't use that in a road car.
Jet Hot, HPC and Swain Tech coatings are apparently OK on cast iron manifolds.

