I have a 1.5 inch merged header & hideaway exhaust that I was going to have Ceramic coated, but I have it all welded up as 1 item as it returns as a centre mounted outlet like the Porsche Boxter & I find it easier to take on & off this way. I was told that I couldn't have the exhaust coated the same way inside & out as the header as the baffles wouldn't take it. So I thought that I could just cut the muffler off , have it done seperately, (outside only) then weld it back on after. It was mentioned by a friend that u couldn't weld something that has been Ceramic coated. Is this correct?
regards
Jak

you will get more informed welding advice than I,
but I believe that if you just grind back ceramic for the weld then no worries.
-
Could you weld Flange joint on so bolt together later?
-
Could you overlap the pipes so that just a few small stitches are required to secure later.?

When I had my exhaust coated I was assured it could be welded afterwards. Never tied it though.
http://www.hpcoatings.com/ 
:thumb

Why are You having Your exhaust system Ceramic coated?
Stop Rust?
Make it last longer?
and is it expensive?
regards
Lee

From what I understood, the ceramic coating actually improved the weldability.

Best to check with whoever is going to coat it, as I am sure not all coatings would be the same. I have welded a ceramic coated muffler to an uncoated exhaust pipe before, and didn't have a problem.

Hi

My cermamic coated system has had a few leaks at the flanges and I welded them up no worries, it just destroys the coating in that area.

1302Steve

Thanks for that Steve, thats what I thought.
Jak

For a better welding job i suggest that you grind the coating off in the weld area first....

The ceramic coating will act like a slag and probally flow into the weld filler material and give a slag inclusion.
This will weaken the weld,