A 3" cat by itself will not make your car louder, the sound is determined by the muffler/silencer.
The order is: Downpipe, Cat and then cat-back.
Going with a 3" cat in my opnion is not a good idea, you need a 3" downpipe, and if possible, a 3" cat-back.
That's what I have in my car.
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Patriot Blue 5-Spd, Stage I, Mopar BOV, BTG Intake, Custom 3\" Turbo-Back, Spring Mod, BTG Shock Tower Brace, Vogtland Springs, Koni Shocks, Eibach Sway Bars, Azev Type M 18x8.5 wheels, Ventus K104 tires, Projector Bi-Xenon Lights, Rear spoiler, Autometer Gauges, Illuminated sill plates, K&N Oil Filter, Mopar subwoofer. Mexico City. See pics: http://www.sportcarsforum.com/forum/viewtopic.php?t=715
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