1uz is super cheap.. takes like 8 wires to run , no need to get a computer reflashed.
stock ls1 rev limiter is 6200 rpms 1uz is 7200 rpms..
while that might not matter to some..
with my rig and gears ect.
with my front case in high , rear in low , 5th gear ,6200 rpms is 89 mph...