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I just installed my after market parts and let me tell you my 2004 mustang GT MT 5 Speed convertible is another beast.
Here are my mods
Diablo sport predator performance 93 tune
BBK Cold Air Intake
BBK 78mm Throttle Intake and plenum
Deleted muffler
Next in my list are underdrive pulley, can you guys tell me how many horses i'll gain from pulleys i also heard that pulleys can damage my engine, is that true?
I just called a mechanic and I asked about doing gears 4.10 and he will charge me $650, include the gears, oil, labor and anything alse i may need, do you think is a good price?
I'm usually not the bad guy but with the OP mods he gained what 8-15 hp? I mean, we all know 2V's don't respond well to bolt on's (gears yes, but bolt on's, no). OP once you install the gears (I would vote on 410's) you will really see a difference in your car. You're off to a good start though. Good luck man...