Hi, so i have maxima qx v with vq30 na engine and id like to upgrade it but i cant find parts (injectors/fuelrail, intake etc) help wuold be appriciated. If any of you know any direct fit or adapter modifications pls tell me. ( all performance mods that comes in mind and tips and tricks is appriciated)

 

There are plenty of mods out there, some of varying quality. A common modification is for the air intake / air box since Nissan's factory design was questionable at best. Could you be more specific about what you want to "upgrade"?