Speed inc built a set that will be out shortly that put down an extra 30 HP to the rear wheels! It is quite expensive though, $800 I think, but they come coated and all.
I am too afraid to change the exhaust on this car I like the way it sounds stock, I don't want to ruin that. It is true duals already from the factory, so I don't care to gain a few horsepower to lose the sound. I am looking at a pretty sweet heads and cam kit from speed inc that runs about $1800 that would really awaken this car. Most likely though I will just do Nitrous for the summer... heads and cam will follow maybe this winter.