Mine just held water in it and rotted the mild steel manifolds i first had.
Then i got a stainless one and they all cracked.
Now i have an Inconel manifold and it's not wrapped.
Same with motorbike exhausts, the current thing is ceramic coating have ben told.
I looked at going down the ceramic coating route, you can get it done for sensible money now.
I decided i did want to do it to my genuine VW Motorsport manifold in the end.
@lynx started
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Mine just held water in it and rotted the mild steel manifolds i first had.
Then i got a stainless one and they all cracked.
Now i have an Inconel manifold and it's not wrapped.