for the most part:how built is the z6?
pistons
rods
valve springs
valve spring retainers
cam
head studs
port matched intake manifold-head
bigger throttle body and port matched to intake manifold
y8 intake manifold
then the normal turbo stuff:
2.5" mandrel bent chargepiping
dsm 450's
chipped ps9 running vtec
3" mandrel bent dp and exhaust
johnnyracecar intercooler