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they lower your top END (not top speed for those of you who use them interchangably) so they allow you to move through the power band quicker, just go with 4.10s
I just set up a date to get my 4.10s installed.. I don't drive my car unless theres not a cloud in the sky and its nothing but sunshine.. Even then I keep it on city streets to show off.. My Cobra only sees highway about 5% of my driving so the 4.10s will be great for me..
If you do highway driving better keep your stock gears.. [sm=bounceybounce.gif]