If he says he can see it in the photo, I'm assuming he is referring to the bolt head and not the threads. I prefer using torx on all allen/hex bolts - they seem to round off far less often that way.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |