Well i know i replaced my engine and we ended up putting a 2001 Grand prix gt motor in it and we had to switch the manifold back to the one off my 1995 motor because i didnt bolt on. Also i was wondering when i comes time to start buying other parts (rockers, cams) do i buy them for the grand prix motor or are they all the same. lol

Not quite. I believe Will said there are like 5 different rear mani castings. I know the H-body, and the Riviera are different from each other as well as different than the W-body rears.
I do believe the front'* are the same all the way across SII L67/L36'*.
I wonder if the L26 or L32 have the same mani'* as their SII predecessors?

they might be the same but play it safe

Ah, only the fronts are the same. That would make sense.

hey do they make them for a L27

L27'* dont need PEM'*, there is nothing to really grind out and they are port matched from the factory. My PEM'* came off a Buick L67 I believe. They may have different part numbers but I'm guessing they are all the same.
Don't take my word for it though. :?

Yeah the rear manifold is diffrent on the 95. I found this out after i bought pems. :?
So i got a new DP and got ripped off real bad.<--that'* a long story

so i would have to get a downpipe to? whats a good place to look at those?

Your best bet would be to send in what you have currently to get ported. You wouldn't have a car for a while though. You could always go to a junkyard and get a set from a similar car to get ported. This way you know you will get a match and won't have to mess with a downpipe.

thats a very good suggestion. who can port them, i mean this isnt something i am going to do for a while unless i can get it done cheap. but i want to do my homework on it