changing center sections isnt that big of a deal
ball bearing really isnt worth it IMO. I had one on my accord (2.2L), and spool time only changes about 400-500rpm. not really worth $600 and something u can not rebuild when it goes bad.
http://www.accordclub.com/lastmotorp...s/P1010041.MOV
remember this motor revs to 8k though...
with the BB, i made full boost (9psi) around 3000rpm, with a non bb, it would be 3400-3600. t3/t04e 54trim, 63ar. wish i would have stuck with my 57, or even a little smaller with a 50.