You need to cut about 3 inches out of the head pipes on the 66-67 system to make it fit the shorter wheelbase 68-72 cars (115"vs 112"). Other than that it fits fine, I just cut 3 inches out in the straight part of the head pipes (67 GTO)and butt welded the pipes back together lining up the seam on the tubing so it was indexed the same (70 GTO). If you can't see the tubing seam (rusty) I'd score a straight line about 5 inches long before I cut the 3 inches out. You need nice square cuts so the pipes are still on the same plane when re-attached. If you can't weld your gonna have a problem making them fit and looking like it wasn't butchered up.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
Last edited by Sirrotica; 04-12-2011 at 10:01 PM.
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