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I was pleasantly surprised with Summit Racing's brand of Turbo Mufflers. I put a whole exhaust system of theirs on my 67 and it sounds quite nice. I have another coming today for my 66.
I guess I'm just a drop in the ocean. I have Flowmaster 40-series on my '66 289-4V. Hooker headers, H-pipe and 2.5" all the way back to slant cut tips. Call me crazy, but I love the sound. That is certainly one thing that I wouldn't change about mine.