I've only tried Magnaflow on my daily Yukon. Their cat-back system. A little too much sound for me on a daily and had a terrible highway drone. Flowmaster has several different styles of mufflers and they are rated by sound, I swapped just the muffler on my Magna system over to a flowmaster an have been very pleased... something I noticed though, usually the quieter the muffler, the bigger the muffler... pay attention to the sizes.
Jef-
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You remind me of the timing on a turbo engine...
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