[DarrenWS6]

For deep and aggressive loud, get a singl inlet dual outlet Flowmaster Super 44 ( part #9430452.

For the same ( or maybe a bit more ) volume in a deeper clearer sound, get an 11" Magnaflow body ( part # 11366and in the long run cut the rear converters out, or add the hi-flow converters whatever your more comfortable.

For a more mild sound, with a single inlet & dual outlet configuration, get a 14" body Magnaflow ( part #12198. Gives you the dual look and almost the same sound as the single 11", but a bit quieter.

Hi-flow cats flow better than OEM cats and volume it up much more. You dont need them but if you want added sound & possible mileage gains, it could be worth it. If you go with the Super 44, you probably wont need hi-flow cats cause those mufflers are quite loud.

Fair warning though, 1997 truck, if you change the cats you may need to get all 4 O2 sensors replaced, and thats pretty pricey, so if you decide to change them to hi-flows, have a couple hundred aside for O2 sensors if yours go bad.