As far as time improvements, if you are using slicks and can get all of your power to the ground without spinning you may pick up a few tenths...but some actually LOSE time based on the extra shift before crossing the line. From a street perspective, it will FEEL faster, as the car is in the powerband more often. I guess if you want specifics, you would need to check with someone with a nearly identical setup as yours, and see what they found with the gear swap. Unfortunately, I still have 3.08's in mine - and will put in 3.73's when $'s (OK, Wife) allows.
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