It will be the sound you will notice more than the power. Demon brings up a good point about the pipe bending, last system I did I ordered mandrel bent sections from a local speed shop and welded it all up.
98 Contour SE 3.0L 5-speed
SCT PRP, Gutted IMRC's, Fidanza Flywheel, Race Ported 2004 3.0L Oval Port, Zex 125hp shot, 70mm Mustang TB, 42Lb injectors,Walbro 255 pump, Traction Bars, Zeitronix wideband o2, lots of little things, 10,000K HID's!! 
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