Ceramic Thermal Coating - The purpose of ceramic coating downpipes is to keep heat in the exhaust gases In the downpipe from radiating out. This retains underhood temperatures lower and fewer heat absortion by nearby elements/surfaces. An additional added reward is the fact by trying to keep in warmth (energy) https://gregorywbgk18406.blogaritma.com/27723924/understanding-downpipes-catless-vs-catted-downpipes