They are pretty quiet compared to most perf mufflers, but deeper and louder than stockers. They flow tons of air. I've had them on my Saturn & Escort GT, Chevelle & 01 Monte.
IIRC you have no resonator and no U-bend so you will notice a little sound increase but you will get no drone with these. Make sure you order the smaller of the two models.
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03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator