Just to give you some ideas...
This is the intake that Nismo designed for the 380RS-C. The engine is a 400bhp VQ35HR stroked to 3.8L. Looking at the plenum it looks like it has ITB's. Anyhow, you can see how they used cone filters (which appear to be the short JWT-style ones), along with fully covered heat shields that seal all the way around and all the way to the air ducts. Thus any air entering the engine is fresh from the ducts only. Also note that the stock ribbed intake pipes are replaced with smooth aluminum piping that gets rid of the resonator boxes. You can get the Cobb intake pipes to replace the stock units.
