Just take one look at the sales numbers. Nissan doesn't sell anywhere near 100K Z's every year like those domestics do. They sell about one tenth of those numbers.
Far fewer Z sales = far fewer potential customers for aftermarket sales
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |