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What year is your 4.6 & what mods? There are many different combos's for a great sound. I run custom H-pipe, Glasspacks & turn outs to my rear tires. It reminds me of my 5.0 rumble & cost pocket change to build. But that doesn't work for everybody
I had the pypes MM and O/R X on my last s197...it souded wicked, but was really loud! too loud for everyday driving(at least here in N.J) I think with hi-flow cats it would have been perfect though!