I suspect you means "Banks" power pack.
There are other ways to improve performance, but bear in mind, you're basically driving a fully loaded (weight-wise) cube van, it's never going to handle or accelerate like a 'normal' vehicle.
There are two main issues, the first is air flow in the engine, fresh air in & exhaust out, improve that and you'll see a big difference. The other other is the engine control programming, that's easy to do, plug in a programmer and go, big gains in engine performance. But bear in mind it all has to balanced. Lots of 'air in' capacity but no additional exhaust capacity will do little. Likewise, a bigger exhaust system with the factory air box won't help much either.
All in all, I doubt you could get the gains you'd get from a Banks Power Pack by picking other components yourself for much less than the cost of the Banks package.
Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).