hes right we need to know more about the car, and you can use basically any pipe or muffler you want, its all just a matter of how they sound, the engine it self is fairly quiet, and only really gets loud when its coming off the headers, or if you straight pipe it. the best suggestion it to youtube videos of sonatas with different exhausts on their cars and find out what you like and go from there.
I got the 3.3 v6, I'm thinking of getting a high flow cat, eliminating the resonator then going ahead to get two Borla mufflers which are universal 2 1/4 inch fitting "Koreanautoimports.com" have a catback exhaust it's listed as 1500 $
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