Im looking to have over 400whp from my g.

Im thinking stillen sc with some internals. Tranny cooler, oil cooler, osiris etc.

Or straight engine swap to a ls engine or even a old muscle car engine. I currently have 2 engines to choose from. A dodge 440 or a 69 chevy z28 in the family that aren't being used. And would probably get for free

 

I'd try to get a G37 motor and sc that. Either that or get a 5.4 from a Nissan Titan.

 

i takes a lot to get one of those big motors in our engine bay. SC with a built motor and you will be happy.

 

Pshaw! A guy who would even mention a stillen SC then follow up with the suggestion of transplanting an engine out of a 60s dodge or chevy MUST be a heck of a mechanic.

I read tons of threads on the forums here and on 350z that the LS swap is a breeze and more often than not will help save MAXIMUM dollars- probably cost half of what installing an SC would. That's probably the safest route.

But really, the stillen is also a top notch product, often netting roughly TWICE the advertised gains on the VQ- provided that you have a short throw shifter or at the VERY least an AT.