One of if not the best value for money mod that every performance motor benefits from is an aftermarket cold air intake kit. The VQ35HR and VQ37VHR fitted in the late model Z33 350z and Z34 370z is certainly no different with power gains of 15hp+ achievable when using the GKTech intake kit (in this case, combined with your own pipework and filter)
We have made complete kits for the Z34's but understand that some people prefer a more DIY approach.
This listing here is for the silicone kit on its own.
The silicone kit includes the 2x smaller breather hoses, 2x reducers from the throttle body to suit a 2.5" pipe and includes the 2x custom bends to run through the factory radiator support (without the need for cutting)
NOTE: on the VQ35HR the breather hoses included here will not work (they are Z34 specific) but you can use your OEM hoses with ease.