Noob question about hp....

snizzle

newbie to the forum. joined because a buddy of mine let me borrow his 350z while he was out of town the other week, and i had a blast driving it. i loved it so much im now thinking about getting the 370. i love just searching through all the forums and filling my head with all the knowledge.

heres the question: ive been reading in the exhaust and tuning forums looking for ideas about mods and hp figures vs overall cost. i see alot of ppl talking about getting their 370 up to like 285-hp or so with the k and n or whatever their CAI choice was. now nissans website says the '12 370 base comes with 332hp. so why the difference between the stats from nissan, and ppl talking about the increase they received from whatever bolt on they acquired being drastically lower than what nissan says the car comes stock with?

thanks.