My Pacesetter's were perfectly fine; and with the largest primaries you can basically get anymore (albeit finding a set of TOG X's), all you have to do is weld the crossover with the collector, and have the three bolt flange removed and welded to the collector.
Basically you end up with a front header, and a one piece x-over, RH, DP, and flange to bolt it all to the catback.
And for those ready to jump in saying you can't do it.
LOL; all you have to do is remove the dog bones and the rad fans...and it literally slides in sideways, then twist it to even it up with the head. I did this multiple times. Now if you have a couple people with you; take the hood off really quick. Then you can literally throw it in there.
Lets be real. It's a Grand Prix. No one really cares what it looks like. Even if you break the cowl and the windshield.
See here. K; thx.
http://www.grandprixforums.net/threa...r-Modification