If you want to know which is deep read the Exhaust design effects on noise article and you will know how to tell the difference by just looking at the muffler. If noise is that much of a concern to you contact the manufacturer and ask if it comes with a resonator or not.
and also read the articles related that are mentioned in this one. btw, this has been covered sooo many times, i know your new - but the search function to the left of this window will give you information quicker than waiting for replies.
edit: arrrgg...typing class has done nothing with my typing speed!!!
ever heard a Honda f1 RA002E engine's exhaust note down a long straightaway at 18,000 rpm? symphony music man...The BMW P82 engine in qualifying trim now revs to 19,000 rpm...reportedly 890 bhp and 60 bhp more than the latest improved spec of Honda engine...better than Faith Hill on a good day...