I installed a 2 1/2" Pypes X pipe system on my '64 GTO in 2010. I used the Pypes mufflers, the quietest of three they offer. It's a 4 speed, 428, with '67 HO cast iron exhaust manifolds, 3.23 gears, so I'm running about 3000 rpm at 70 mph.
There is no drone whatsoever. The sound is a little "raspier" than stock OEM mufflers, but quiet inside the car while on the highway.
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'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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