Yes. I don't have a coated vs uncoated RLS to measure that difference.Are you comparing your heat reduction to the difference between coated RLS and OEM cat after removal?
One of Ricky's pages says "our Ceramic coated model can reduce heat up to 400 degrees coated with glacier ice from Cerakote". "Up to" is an interesting marketing term. Zero and one are below 400, lol. I cannot find any test data regarding temp reduction on Cerakote's site.