I spent a couple hours comparing all the sounds too! lol
Sounds to me like the MAC setup is the deepest agressive sounding. While the others are high pitched and annoying.
Except for Delta (2 chamber) Flowmasters, they are loud, and deep, yet not annoying. But not as deep and agressive as MAC.
I personally like the sound of MAC the best 
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Torch Red '02 GT Convertible 5 spd
BBK long tubes, BBK h-pipe, MAC mufflers, K&N w/ silencer trimmed, FRPP 70mm throttle body, C&L plenum, Mobil1 synthetic fluids, FRPP aluminum drive shaft, Steeda Tri-Ax shifter, FRPP 4.10's, 18x9 & 18x10 Saleens with Dunlop SP Super Sport Race rubber, Mach1 grill (GT delete), & Mach1 bumper chin!
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If you are in Northern California, check out North Bay Mustang Club for local meets and cruises!
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