I understand that 1988 exhaust manifolds are different from pre-1988 ones. If this is true how do you identify each?

First I heard of it. I have a Formula parts car that I could go look at if you can tell me something to look for.

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Jonathan

'68-69 GTO Nose - The Project has Begun!
My '85 L67 Build Thread

V6 exhaust manifolds are all the same as far as I know. I've never heard anything different.
There IS a possibility that the 88 heat shielding is a bit different.
I know it is on the crossover. (The 88 being insulated with an asbestos(?) and heavt foil wrap. The earlier years having several pieces that bolt / clamp into place.)

quote Originally posted by Raydar: I know it is on the crossover. (The 88 being insulated with an asbestos(?) and heat foil wrap. The earlier years having several pieces that bolt / clamp into place.)

No asbestos insulation on the 88's. It was only a two layer stamped sheet metal (light gauge/thin sheet metal) heat shield that was basically two halves spot welded together. Nothing other than the sheet metal.

The one I removed had some sort of insulation in it. It was at least 1/8 thick.
Looked like some sort of coarse white fabric or fiber. It was not woven, however. (Rock wool comes to mind.)
(I remember it clearly, because it creeped me out when I was removing it.)

Perhaps there was some sort of mid year production change.

[This message has been edited by Raydar (edited 10-13-2013).]

The exhaust manifolds are interchangeable; the crossover, downpipe and exhaust pipe are different and not interchangeable.

Edit for smart phone.....

[This message has been edited by olejoedad (edited 10-13-2013).]

As mentioned above, the '88 and pre-'88 have different heat shielding. But as far as I know, the manifolds are interchangeable.

IIRC, the only difference between 88 and the earlier V6 exhaust manifolds is that the attachment holes have been ovalled a little to allow for expansion. They are all functionally interchangeable.

The 88 crossover pipes insulation is fiberglass.

quote Originally posted by onesexyfiero: The 88 crossover pipes insulation is fiberglass.

No, it's not. Just stamped metal.

The manifolds are the same, the crossover pipes are different.

I have to assume you are talking about V6s.

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quote Originally posted by sardonyx247: No, it's not. Just stamped metal.

quote Originally posted by Raydar: The one I removed had some sort of insulation in it. It was at least 1/8 thick. Looked like some sort of coarse white fabric or fiber. It was not woven, however. (Rock wool comes to mind.) (I remember it clearly, because it creeped me out when I was removing it.) Perhaps there was some sort of mid year production change.

quote Originally posted by Raydar: [QUOTE]Originally posted by Raydar: The one I removed had some sort of insulation in it. It was at least 1/8 thick. Looked like some sort of coarse white fabric or fiber. It was not woven, however. (Rock wool comes to mind.) (I remember it clearly, because it creeped me out when I was removing it.) Perhaps there was some sort of mid year production change.

[/QUOTE]

You know thinking about it, some of them may have had some of the white crappy GM insulation that powderizes and falls out, in them. But I'm not sure. I know all the ones I have seen in the last 8 years all had nothing in them.
I have seen too many Fieros since back then to remember.