they let that 3.5 engine breathe more. Put a way better transmission/gearbox and make it as light as possible the thing sould kick some serious ass. So far I like the feel of the altima, aside from the way it shifts. I shopped for like 3 months before I found the exact one I wanted. Silver like the commercials except with a spoiler on the back, and it had to be 5spd. Kinda regret the 5spd cause I think they slipped a little in that category, the thing should sync up better than it does. Over all I am happy with the performance, and having to restrain myself from modding the F!@k out of it. Just exhaust and intake would help alot i think, and the exhaust is going to sound great opened up.