ericfreeman wrote:Kreem makes a ceramic-based liquid I've used to coat the inside of my Ironhead Sportster pipes to eliminate any bluing. Easy to use and it appears to be very effective. I'd imagine it would prevent corrosion as well.
If you've got brand new pipes, I'm sure it would - They only recommend you use it on new, never run exhausts
Not sure it would do anything at all on a 30 year old system which is already rusty