I believe that the left center exhaust exit is the correct one for both single and dual exhaust on the 65. After ordering and playing too many games with the kit suppliers, next time I will go straight to the custom exhaust shop. Won't probably be any more money all together and no headaches.
We added headers later and that really gets interesting with the stock 65 crossmember. We cheated - bought a 67 GTO convertible crossmenber off ebay and added about 3" on each side and just added a little bracing. Now have 3" extensions coming straight back from the header collector back to the cutouts and the 2.5" X-pipe. No-one notices the new crossmember unless I point it out to them since the center section and the area around the pipes is Pontiac correct - just a different year of being correct. Other mods I have seen done scream out that there has been a massive alteration to the crossmember. I would bet that a 67 big car convertible crossmember would have possibly fit with no extensions, but gave up trying to find one since we had a Pontiac points race coming up and needed to get it back together.
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