i have an 04 expy with the 4.6 and i was wondering what you guys recomend for a bit of power increase. i already planed on getting a k&n and i was thinking about just swapping the stock muffler for a higher flow one. i don't want it to loud otherwise i would go with a single in dual out set up. i don't want to go to extreme with a s/c or turbo or anything like that.

thanks

 

Stroll over to the Chips, Tuners & Programming section. XCal2 Tuned by Mike Troyer will get you the best power increase for money spent. If your skeptical, just poke through the posts and you'll see all the positive reviews and experiences of other members. (Troyer specializes in the F-Series platform, but has tuned many Expy's as well)