Originally posted by todras:
one of the hottest areas in the exhaust 'feed gas' temps is in the 'Y'pipe. Changing the Y pipe from stoc to an off road 'MILD STEEL' type with stoc exhaust manifold with the cats still in place,is asking for trouble with the mild steel exposed to elevated gas temps which will cause it to oxidise at a rapid rate.
This is bumming me out. I have a basic ceramic-coated and wrapped MSDS Y-pipe with stock manifolds.
Not that I'll rush out to unwrap it. Anyway, I kept my stock Y, so maybe I'll have it optimized one of these days and put it back on.
As for insulative vs conductive coatings, all of the coatings I've seen used or talked about claim reductions in underhood temps (Jet-Hot, MSDS Extreme, SwainTech, etc), so I'm assuming they are insulative. It's also my understanding that the JH coating is inside-and-out, which is a major superiority to wraps in terms of hi-temp oxidation. Or at least that's how I've understood it.
Good info from TH, but I'm stil a bit confused.
Function before fashion.
'96 Contour SE
"Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998
| 
