Originally Posted by Kevin

Viggo, the NA heat exchangers are also very good. You "Can" coat the inside of the stainless piping. Wouldn't gain much on the outside. But you can coat the inside. However, there is/are better options to explore like upgrading your CAT cartridges to more efficient units. Freeing up your NA exhaust system will give you more benifits vs coating>>porting and cleaning up the flanges/fittings will increase the flow.