I've got the IL exhaust system for my 4-speed 68. I bought it during the Black Friday sale a couple years back. The money I saved paid for the shipping.
Now you can by some IL parts through Amazon and save on the shipping, of course they price this in to the final price on some/most items.
It's a decent system. I had minor issues with it fitting and had to trim the DS down pipe at the muffler to get everything to fit and line up properly. I reused as much of the stock hardware, clamps and hangers that I could for the system. I think I only had to purchase the rear clamps for the tailpipes behind the wheels, but still used the original hangers. The same ones OG68 had to in post #2. Much different from the cobble system I had on previously, but no where near as loud and deep as before (flowmaster 40 series mufflers).
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1968 Pontiac GTO - Verdoro over Ivy Gold - 400/4-speed/3.08
1987 Pontiac Grand Prix - Sage/Sage/Sage - GM 305/Th200-4r
2004 Pontiac GTO - IBM over Black - LSx 440/6-speed/4.10 SRA - Single Digit Stick Shift
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