The Prowlers had the same engine and transmission. They put in different final drive gears to give it the pep, and frankly, it was outpacing my friends SRT4 Turbo Neon. Final drive gears are a nice place to start, not a horrible job or a lot of modding and rigging.
They've twin turbo'd the 3.5's as well, more so in the Prowler than anything, but if you can fit two turbo's under the hood of that very very small engine bay it's easy on ours by comparison.
Exhaust manifolds from a first gen are a good place to start, better flow, rather you turbo, or just leave it as is.