I have the SLP "Loudmouth" on my '04 and it lives up to it's name. I'll never be able to sneak up on someone, or to sneak away for that matter
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My Loudmouth has a drone in the cockpit at about 2000 RPM (give or take). It took some getting used to, and some folks may never adapt. I love the sound, and the gurgle during down-shifting. But that's just me. I'm sure a lot of folks wouldn't be happy. I get a lot of compliments from people on the street though. FYI: A friend has SLP's "Powerflow" with the larger diameter mufflers and it is considerably quieter than mine.
See if you can find a couple folks in your area to let you hear some cat-backs in person. That's the only way to be sure what you're getting.