FYI: The 4mo dont need a custom dual, it comes with a dual exhaust from the factory.

If I had a V6 4mo (and sometimes I wish I did), I would do:

Supersprint Headers
Supersprint Full Exhaust
Intake (the BMA one is nice)
Supercharger (or custom twin turbo setup, like the guy on PW did )

If you dont like body kits, just paint the lowers, dump it, and throw some nice wheels on it and call it OEM+ done