I'm taking your opinions on whether I should get 4.10s or 4.30s. My car will be seeing the track occasionally, but is 99% DD. The only difference between the two @80mph is 100-150rpms. I'm more worried about highway driving since when I'm driving around town 5th will become viable. Don't even say 3.73 because I won't waste the money going from 3.55 to 3.73.