Going to nopi in atlanta, gonna bring like 250bucks....what should i get!!?!

i have a 96maxima se and i want to get an exhaust, i was wondering if i might be able to get a good one for 250 bucks, and if not, what would one cost me...i heard that stuff at nopi is a little cheaper than on the internet. what kind of exhaust should i get? even if it costs me more than 250 dollars, i just want to know of a good exhaust, one that would sound ok but not completely drown out all of the noise inside the car, if someone that owns a max with an exhaust on it please let me know how it sounds, btw i was hoping to get about 20 hp out of the exhaust, lemme know if thats possible, hell tell me anything u want about upgrading cars heh im new at this

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