I drive a 2007 Ford Mustang GT with Magnaflow exhaust with 4" tips. I have 3.55 gears which actually came with the car as an upgrade from Ford. I lowered it 1.5" all around courtesy of Eibach. Along with 18" black bullit rims, my tires are 245's in the front and 275's in the back. I also put 2 12" Rockford Fosgate subs in the trunk to go with a 1600 watt SPL amp. I put on an upper and lower billet grille for a little chrome. First dyno run was 265 hp to the wheels with 275 ft/lb of torque. Since I dynoed it I put on an offroad Magnaflow X-Pipe to compliment the catback. Sounds like an absolute beast now. Ill try to put some vids up sometime soon. If you live somewhere in Central Florida look for the D4RKNGT tag, thats me.