H pipe

[GrandestMarquis]

Ok, I have an 83 GM with the 302 and it has the y pipe setup. I'd like to go off road h pipe but leave the original manifolds for now. Will an aftermarket for an 83 mustang work or is there a place that actually sells such an animal specifically for my car?
Thanx

[pantera77]

Nope. You have to use factory panther parts, or mustang parts unfortunately.

[GrandestMarquis]

An off road mustang h pipe should fit though, shouldn't it? It seems like the connecting pipe is longer on the stock h pipe for the grand marquis.

[marquisman]

the problem is, the mustang H-pipe is a bigger diameter of pipe. so, the flanges wont mount up right.

[GrandestMarquis]

Well, headers would fix that. My concern with that however is that the merc is all original and I know that changing much at all requires getting rid of cfi which I'm not exactly ready to do yet. So will a set of headers work with the original heads and if so will headers change the flow enough to cause problems with the cfi?

[marquisman]

if you go with mustang shorty headers, then your set. you would be doing more good than bad, interms of performance aswell. so yes, they will work good with CFI.

[Lincolnmania]

you have to use mustang or mark7 headers to use the mustang off road pipe.......if you want to retain the cast iron manifolds you will need a stock replacement h pipe for the grand marquis