No way would I spend $5000 to upgrade from the 3.8 to a 4.2. I have a 2000 5 speed car. The only mods are Cold air intake and Magnaflow cat back. It's not fast, but not slow. If you really want to make it a sleeper I'd put a turbo on it. Here is a short video of my car 0-60 with the few mods I...