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I'm guessing the issue is the 2.5" exhaust more than the mufflers. I've got deltaflows on my 302 behind Tri-Ys and 2" pipes. I think the tone is PERFECT, and I'm an old fart so most here would probably think it's too quiet! Oh, my delts are 3 chamber. You running 2 chamber?

66 Coupe, check her out at

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