Hey there the best quiet mufflers are Flowmasters 40 series 2 chamber but make sure you get delta force there a little quiter then the regular and every one i installed go about 5 more horse then the regular ones. I work at a mustang shop and i have tried every muffler,hooker,dynomax, gibson, monza, borla, steeda, Flowtech, you name ive heard it, the only thing is is a mustang once you get on it its gonna open up and get a little loud no matter what muffler you use but the the one i listed is the best ive heard.
Ernie
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93 GT 351 to 393 stroker, GT40 upper and lower intake, GT40X Turbo Swirl heads, holley 80mm throttle body, 255 fuel pump, 42 lb injector, JE pistons, Comp cam, comp lifters, comp pushrods, comp springs, crane Roller rockers. Trick flow Crank Shaft, comp Timing chain. MSD 7 series ignition, msd hvc2 coil, MSD timing adjust, MSD Pro billet Dis, Hooker long tube, Off road H pipe 1 chanber race flows, 4.10 gears, Vortech cooler and T-Trim with a 25lb boost AND LOTS MORE.
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