the transfer boxes dont like a lot of power, 250bhp + and its going to get expensive.

you could do a cheap zetec turbo using a decomp plate and rs turbo manifold and T3.

for a quick run down, these are some of the prices i can remember off the top of my head for the costs of my ZT lol

block £100
head (big valve ported and polished) £1200
carrillo rods £800
wiseco pistons £600
focus rs head gasket £30
focus rs head bolts £30
modifed 200sx top mount turbo manifold (wonf fit fwd layout) £200
T3/T4 turbo £280 (its an xs power jobby, bit smaller than an rs500 t4)
injectors £150
titan motorsport roller barrel throttles £850
titan inlet manifold £150
plenum cover would have been about £300
winged/baffled sump £50
piper bd10 grind cam kit £450
piper vernier pulleys £200
cam belt £30
gaskets/bolts etc £100
focus rs spark plugs £40

thats all i can think of at the mo, so whats that, about £5700

fuck