John Flowmaster makes a kit you can bolt directly up. It's called the American Thinder System. It's a 2.5" H-pipe setup, you can get it with or w/o the mufflers. i have it on my 70 and it fit very nice. I had the whole thing installed in about an hour. Any good muffler shop can do the job if you take them the new mufflers. It may be cheaper if you get the shop to get them, ya never know, they may get them at wholesale cost. I ordered my setup from Jeg's and did it on the weekend in my garage.
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