400 BHP 350z VQ35HR Specs?

[SonicT]

I currently have a forced induction system, with k&n cold gas air intakes and oil filter, on top of Cobra Exhaust System + Sports CATS, I was hoping someone on the forum can help recommend mods that can bring the 350z to 400bhp, if possible please link price and equipment below

[Adrian@TORQEN]

Supercharger or turbo to get past the 400bhp mark. NA is terribly expensive and not going to get more than 20-30bhp.