TTI vs Dougs

krazykuda said

We're not worried about flaking getting back into the cylinder, but the ID reduction restricting the flow....

If the ID of the pipes gets smaller, the flow restriction is increased...

Thermal coatings should be on the outside of the pipes, not the inside.... That way it doesn't make the ID smaller...

Click to expand...

Umm, you may be interested in watching the Enginemaster video where Dulcich and Frieburger bash a set of headers on a dyno test engine with a hammer and back to back dyno pulls show no appreciative loss of power. If the theory of more flow equals more power was actually true, we’d all be running 2 1/4” headers on our small blocks. A .015” coating on the inside of a header is going to have a negligible effect on power.