+1 on Borlas, they are the most expensive but have the best sound.
As for the hp gain, all aftermarket mufflers will give you same hp #s its just the sound that you have to choose from and how the mufflers look on your car.
__________________ 07 Mustang Pony pkg 4.0L V6
Appearance: Roush hood scoop, rocker panel, custom GT500 chin spoiler, side louvers, racing stripes, shifter bezel, door sill plates, Sequential tail lights
Performance: C&L intake, Bama/Tillman 91 Race tune, SCT X3, Mac dual exhaust kit, OEM Ford 3.73 gears/T-lock on 7.5' |