I have a set of 3.73's in my car and love them
I'm not sure what kind of mods you have but I have a few things under the hood

. When I installed mine, I lost about 1-2 mpg. So far the highest I got my car up to was 130mph in 5th (stock T-5) at about 4500rpm. I could of kept going, but something about traffic

I get about 17-18 miles per gallon which is pretty good since I can beat WS6's and SS's

(if they are stock and/or with exhaust). You will hit gears much faster, and it will feel like it pulls harder. It does change your shift points. I had to relearn my RPM range for every gear.
It's a good investment and you won't be disapointed.
