My car's not boosted (yet) but I did swap my 3.7 fd open diff pumpkin for a 3.3 vlsd pumpkin. Slightly longer gears and obviously the vlsd is way better, but I did lose cruise control in 6th gear. It still works in 1st-5th, but obviously 6th is where you really want cruise control lol.

For me my 1st gear is useless in a launch. It's just tire spin the whole time. I even tried to limit my 1st gear boost to 9psi and it barely helped. I generally brake boost in 2nd and that gives me a bit of tire spin but I hook and take off like a rocket (2nd-6th gear is at 17.5psi-22psi depending on what octane I am running at that time)