So I've got a 2k v6 with 58k on the clock. A buddy of mine has an 06 civic Si that we sometimes like to go against each other with. Having about the same HP, (and me having a torque of 225 against his 139 ;D) He most times can keep up with me and from a rolling start has faster acceleration. I know this to be from his final drive ratio to be a 4.75 with helical differential. My question is, what gears would be good or my stang? Obviously a t-loc will be added and I've thought of looking at the new ones American muscle recently added or the ford one. I've heard 3.73 manual 4.10 auto due to less gears and different sizes. Would I have any reprocussions from putting 4.10s in my manual besides mpg loss? I don't plan on turboing it, so I'm not worried about turbo lag but I am planning to add a windstar intake and centrifugal supercharger. Thanks for any input and reading all this!