6500rpm's is generally where a stock motor peaks...and yea you do risk blowing ur motor on 450's @ 20psi with the 14b

are you the one who got my teal colt with the carbon fiber hood??

On my first swapped colt (it was automatic) i ran a 2g maf with 550cc injectors on a 16g @ 15psi with no tuning and stock ecu my wideband was reading in the 13 area on the afr reading at WOT altho i had a 4g61t w. the 1991 4g63 head, ecu,and intake when i had the 14b with the 450cc's i boosted it to 20psi and it blew the turbo and my afr's were reading mid-high 15's on stock air box and maf.

but the stock 63t fuel maps were rich for the 61t