as far as mods, how long is a piece of string?
hi flow the turbo, replace wheel with steel unit,
aftermarket computer,
up the boost
metal head gasket i9s a winner but get your block and head machined right
port and polish head
bigger exhaust.....
ect e3ct and so on
availability of half cuts usually depends on where you are in australia,
if your going to buy a whole half cut save yourself thew effort nof doing up the 7M and go a 1 or 2JZ