The promotion is built to withstand 750hp. If you do go with the T56, it will cost you more (unless you piece it together from different places). I am planning on getting some more boost, but not for awhile. I make 431 to the ground right now and in the future am hoping for maybe 550 to the ground.
I think it was 1600 or so. Unless you really want a 6 speed than go with a T56, but then you have some more cost with shortening the driveshaft and what not. I like my t45.
yeah i knew i would have to get a new driveshaft but i am not set on a six speed got 4:10 gears but dont really do a whole lot of driving mabye 1000 miles per year tops so the 6th gear dosnt mean much as far as driveability