no, unless you are trying to merge from a dead stop into 80 mph traffic, most on ramps have more then enough room.
It has a CVT type transmission so it stays in its peak power when accelerating. There is also no chance of making it any faster then it already is, there is an article online somewhere where a guy added a turbo and his 1/4 stayed the same but his mpg increased.
http://autospeed.com/cms/title_The-S...8/article.html
I'm at 110K miles and the only problem I've had is the auto doorlocks stoped working.