I have 2.5" stainless ultraflows, no x-pipe, on my 64 GTO Tripower. It is louder than I expected but sounds really nice. Has deep rumble, not that tin-canny sound like on some chambered mufflers. Like someone said, a little drone around 2K rpm, but it is ok. I like them and would not change them. Pretty quiet idle but really sound off when i get into the throttle.
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64 GTO Tri-Power Convertible, 4-spd
2nd owner, since December 1965
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