the first issue of concern is larger injectors - $1000 should be plenty to get a set of 555s & matching ECU installed. Then you can consider larger turbos and ICs. However either way you slice it a FMIC on a 300ZX is just for looks and hype. Larger side mounts are not only more then enough they are far less intrusive to install and don't creat a heap of complications like intake crowding, oil cooler relocation, and less engine cooling.