If you are looking for inexpensive power upgrades, get rid of your factory u-bend with a u-bend delete or a down pipe. I got rid of my resonator almost as soon as I got my car. It had no resonance so to speak. As soon as I put on a DP, there was resonance and the exhaust note upon acceleration was awful. It was nice at idle & cruise though.
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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