Regarding heat, you can ceramic coat your exhaust and reduce heat as much as 30% in the intake area. You will also reduce heat flow to the block. Flow gains will also be realized using this coating.
The best part is that the coating is almost polished aluminum in color and does not fade away. Check out this link
www.hpcoatings.com.
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68' 912/5 modified brakes, suspension, limited slip trans, hi performance engine.