That diffuser section is probably less aerodynamically functional than the stock bumper, since it looks like it goes lower, creating a higher pressure zone. For a functional looking diffuser, there really isn't anything for the 370z, except for Evo-R's for the Nismo. Nothing else like the diffusers usually found on S2000s.
But yeah they made a widebody version of the kit too. Uses riveted overfenders on the rear RWB style. Except with the way our cars are shaped, it does not look good. Just really ungainly.
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