Did you buy one? I thought mine was sold?
My personal favorite is the Brullen loud with a center resonator, but it's kind of pricey.
You want cheap just buy another center resonator to replace the stock one or remove the stock one.
Cheap and loud=removing the resonator. It can also equal rasp and drone.
Gutting the precats and removing the main cat will make it noticably louder as well, but if you don't have a decent, resonated cat back, its going sound like ass.
You can remove the intake fender snorkle, but you will then be sucking in hot air off of the engine.