Great reply HEISMANHERSCHEL
I went from 3.31's to 3.73's in my manual and wouldn't do it again. I got a humming sound and burning smell in the rear after the install. I was also ripped off by the dealer for the install $1000 P&L.
The worst part about 3.31's IMO is 6th gear on the highway.
That alone is worth the upgrade in gears maybe to 3.55's.
I noticed top end loss with the 3.73's which was very disappointing. The overall performance difference was noticeable but nothing major. 1st gear definitely pulled harder and it felt a little snappier in all of the gears in the low rpm's with a top end trade off. The extra shifting was annoying too on my daily traffic filled commute.
I could however see the 3.73's being good with a race tune allowing you to rev higher and having more top end power.
I think 3.55's are the optimal overall gear for this car for the manual.
In the end I got an auto which pulls harder after first gear than the manual with any of the gear choices and couldn't be happier:smilie