HKS 2.8L Stroker Kit - $7500 USD
HKS Camshafts (Intake/Exhaust) - $2000 USD
HKS Air Intake - $1000 USD
HKS Camshaft Gears (Intake/Exhaust) - $500 USD
HKS Titanium Cat-Back Exhaust - $2500 USD
HKS Down-Pipe - $1000 USD
JUN Intake Plenum - $2000 USD
HKS 800cc Injectors - $1500 USD
These are just some of the many parts I've changed. That's roughly $20k, and that doesn't include machine work, installation, and the rest of the freaking car. Thank god the stock drivetrain itself is nearly invincible, the GT-R can hold 550+ WHP without shattering, theres some guys running 800 WHP on the stock GT-R differentials, but obviously drag clutches, etc. Transmission itself will hold 400 WHP without problems, the R34 GT-R will hold 500 WHP on its 6 Speed Getrag transmission without shattering.
Anyways, I'm thinking about selling my skyline off to finance a house or something. That's part of the reason why I want a 5.0 too because its nice power, for *pretty* cheap. Did I mention my having 500 RWTQ would be nice too? heh I'm barely past 300 WTQ on my build right now for my skyline.
Just give me a PM buddy, you sound like you know some stuff