NOOOO

Unless you have stainless exhaust then it will corrode from the inside out!!

Exhaust gasses are fairly corrosive and this is made alot worse when you wrap them due to the sustained high temps that they will see.

i am not even convinced it is a good idea on turbo thick wall manifolds after seeing large flaky bits falling off the inside walls of these types of wrapped manifolds.

I worked in an exhaust shop for two years and that is my opinion anyway.

If you want a better option go get some ACL heat shielding material HR140GTR i think.

I worked there for a year as an Engineer and it is a good product and easily formed into a manifold or body style of shield and will stop the radiant and soak effects but will allow a bit of convection to carry heat away on the move.

Ben

well i gave the heat wrap a go

and i tell you what they must hold a shed load of heat in the primaries

the engine bay was much cooler, but the enourmous amount of heat kept in my exhaust caused a large backfire and a 1 foot flame from my exhaust within 5 seconds of switching my engine off

ive heard its pretty common for bridgeports to do that depending on your exhaust setup..

so while i liked the cooler engine bay temps
ive ditched the wrap, i really dont wanna be shooting flames when i stop to refuel

Quote:

I heard that too.
But I still run it.

I've heard that they do such a great job of retaining heat, the metal fatigues and falls apart. It's the high heat not the rust that's bad.

if youre that worried put a bit of oil all over them i find that oil never fully burns off so might be a bit of protection.

I was told that in order to wrapp the headers/extractors w/o rusting the primaries the pipes got to be ceramic coated.
Regular metal would rust prematurely .

I had some heat wrap on my old 351, spilt some brake fluid on it and they cought fire. Just something to watch out for, cause they are fiberous, they are absorbant. True water will just evaporate but watch out for other liquids. But they didnt seem to rust though.

i think i might give it a go

thanks for the opinions fella's

Not sure about your side of the world, but over here practically every company that sells header wrap also sells a sealing product. You spray it on after you wrap and it's supposed to prevent rusting.

If you're still worried about corrosion, you might also want to paint the headers with a proper header paint. It should be a a silica-ceramic coating and you have to following the curing directions closely otherwise it will probably come off. The curing directions involve heating and cooling cycles with increasing temp with each cycle. It can be done with the header on the car.

for a daily no for your rotor ute, yes... you need to keep as much heat out of the bay as possible.
also you dont store your car in the open so wont be a big issue for the rusting