Seafoam is usually pretty impressive stuff. I personally would not recommend any commercial do-it-yourself cleaner for the 370z, as Nissan advises against it in the service manual (section 9-5 in the 2013 manual, not sure where it's at for prior years):
Quote:
NISSAN does not recommend the use of any fuel additives (that is, fuel injector cleaner, octane booster, intake valve deposit removers,
etc.) which are sold commercially.
Many of these additives intended for gum, varnish or deposit
removal may contain active solvent or similar ingredients that can be harmful to the fuel system and engine.
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Nissan, as well as other manufactuers, have been known to use BG44K for high-mileage injector services paired up to an actual machine (mentioned earlier in this thread) that cleans the fuel system while it's disconnected from the actual fuel rail.
If you're running a premium fuel which already has detergents included (such as Techron), you should not have to worry about any kind of excess buildup in the injectors, as the gas and detergent will "wash" the injectors and intake valves.
Nissan does not have a service interval specified for the injectors. Also, any dealer that tries to sell you an injector cleaning ever 10, 15, or 20k miles is just upselling you for extra cash.