What are the stock manifold made of? I'm guessing that it is very unlikely that the stockers are stainless (at least I know in most vehicles they are not) so I think the ceramic types would last at least as long as the stockers would. Anyone able to confirm the stock material?

-D'oh!

 

sotck is cast iron

 

So if the stockers are cast iron, are we saying the ceramic coated ones are worse than stock in terms of the material and its durability??

 

I guess we will have to see what these can do...

the Nismo Headers still have the largest collector out of all of them...

and the "new" nismo headers are avialble now...

so I gotta get a set and open them up and see whats different from the older ones...

 

If the stocks are cast iron, then I'm thinking the ceramic coated mild steel version would last at least as long as the stocks would, and probably longer. Maybe some one with some experience can confirm this?

I think the only conern with the coating would be if it chips off or something, but that seems very unlikely given the placement of the headers.

-D'oh!

 

If im going to go in there and change out my headers, im going to do stainless steel because I do not want to have to go in there and change them any time soon...

id besure your exhaust has the flex piping in the Y-pipe if your gonna go with mild steel headers...

 

stainless is not always a superior material. Just with any metal there are good grades and cheap grades. Good mild steel is better than cheap stainless. I am not sure what grade they use yet, but I can tell you we have used past headers from DC interchageably depending on the customers budget (stainless being more costly), and have never had an issue with either one.

I cannot see how the stainless ones vs mild steel would put anymore demands on the Y pipe. Nearly every aftermarket Y pipe I have seen has a flex provision anyway

 

Thoughts seem to differ on this topic. I never really thought about the flex in the Y-pipe, but if the stainless is stiffer, it would seem that it would need the flex in the Y-pipe more. I know that most of the true duals don't have this flex provision. Man, why can't this stuff be more cut and dried.

 

Also, you dont want welds to crack...

 

Sooooo what are we saying here, all true duals are bad cause they don't have flex sections?? Can't really say I agree with that.

 

no im not saying all duals are bad...

its a little different with the duals, since they transfer weight a little differently...

you have to think when a car goes over a bump everything moves... if the exhaust was not supported by shock absorbing rubber, then the vibration from running over pavement even will eventually crack welds...

flex pipes help reduce that effect...

i am not saying if you dont have flex pipes the welds in your header flanges are going to come apart... but it could happen...

basicly anything can happen.. but the more precautions you take, the least likely they will