My choice has been Hushpowers by Flomaster.I dont run 3in ever IMO not necessary on a 100% street car.I pulled a set of Hushpowers off my 69 bird as a neighbor remarked how load it was at 5:30 in the AM when I leave for a car show.I replaced with a set of Super turbos and they are a touch more quiet at idle but are loader at 2000-2200 where I drive it on the highway.I run 2 1/2 from the manifolds or headers back over the the rear and out the back.Im getting ready to pull my 455 D port engine with manifolds and replace it with a 434 RAV.The car will go to the header shop for a set of custom build on the car and at that time I will have him put my Hushpowers back on.Also when ever I have used a X pipe I get the drone at about 2000 but it went away with a H pipe in all my applications.FWIW,Tom
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