[ab_mach1]

You never want to get to the point where you have to go into 5th gear. 4.30's might make you have to lift the accelerator on those really long straights. Those TR3650's are really geared more toward the 1/4 as well. That first gear is granny-low, like 3.30+something. If you have 4.30's and ever need to drop it in 1st on a super tight curve, it would suck IMO. I'm certainly no expert, but I would think 3.73's would be low enough to make 2nd gear useful for those situations. I would definitely see how it does with the stock gears before doing anything, though.