Need ideas for sup up ...

I got a '97 RAM pickup, I supped the exhaust by making a double pipe, and i got new 19 inch mags for it ... But here is the deal, i wanna get this truck to go fast, not just be a wanna be like so many Civics out there. I own a serious machine with serious potential ... So I wanna get all that potential out, you know?? I've got a 400w sound system going with two 15 inch woofers and an 8-inch speaker installed through the box ... Now i need power for it ... Any ideas?? ((Besides intake and manifold??))

-JS:comprage1 :eek7: