Go here:Chris, I live in California and cannot find any CARB (Ca Air Resources Board) compliant replacement full exhaust for my '06 LJ Rubicon.
https://ssl.arb.ca.gov/AftermarketParts/catalysts
You have plenty of alternatives now for CA approved stuff. If you get a list to your local muffler shop or buy the approved stuff and take it to them you can save allot of money. You don't need the whole thing to be CARB legal, just to the rear cat. The rest can be anything you want. I think you can even replace individual parts now.