Assuming this is a 3.0/4.0...
If you want loud, go with straight pipes. Saw off your muffler. Cheap, loud as hell, and relatively safe. However, expect lots of 'burping' an crackling when revving it high, IMO straight pipes don't sound good on a Ranger.
It's probibly best to use a muffler of some kind. It won't be as loud, but it's safer, and you'll get a warrenty. Flowmaster 40's sound very nice, it's what I have and I think it's a notch above the others. Not so much good for performance, but if you're like me and love the tone, go with a Flowmaster.
My B3000 (Ranger) with straight pipes
Same B3000 with Flowmaster