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I have one idea you might want to consider. Straight pipes. If you have the stock cats and maybe even precats the sound shouldn't be too loud. I don't have an Eckler's catalog, but Mid America sells them for $130.
The muffler eliminators I have seen are 2.25", I need 2.5" to match up with the stainless y-pipe. I do have the option of putting in a cat at a later date. My test pipe is in because the cat went bad and I am just filling the gap for now while I make some mods. My vette is not fouling the air for you west coast guys, it isn't even being driven on the street right now.