The Great Cornholio

Agree, use Ford Racing (FRPP) gears, and get a speedcal or flash tuner to reset the speedo. The 4.10s will get you into your power band quicker, much quicker. I assume the gears in yours now are 3.27s. BTW is your GT Sonic Blue or True Blue?

DuckyGt

i had mine dynoed before my 4.10's with just a full exhaust i had 230rwhp but im an auto

04GTMustangRob

i have stock gears in it right now.

and it is what they call the "azzure blue" the color that gets a hue of purple when it is dirty.

Deannostang

Ya, gears are great. You can also consider a new Accufab plenum and throttle body. If you add those two items with a new catback such as the Magnaflow, you WILL notice a difference. If you want OUTRAGEOUS, gears will do the trick fastest. For all around city/highway everyday driver type thing, 3.73's should be fine.