What do you have for an air filter and intake? A huge amount of noise comes from the intake. If you have a proper airbox and snorkel, it can make a huge difference. I am a fan of the Moroso spiral flow mufflers. They are free-flowing but also do a decent job at reducing exhaust noise. They aren't exactly quiet but quieter than straight-through glasspack mufflers like magnaflow or flowmaster flow fx.