Im getting my ported o2 housing and exhaust manifold soon and I was wondering if it would be worth it to coat it, I dont expect any hp/tq gains but how much benefit will I have with the reduced underhood temps...

thanks

 

The drop in underhood temps are noticeable both in feel when you pop the hood with the engine running and also in decreased air intake temps @ the MAF. I think my favorite benefit though is that the cast parts stay looking nice for years instead of rusting within a few days.