Don't go OEM, waste of money IMO. I went with the Magnaflow for 04-05, is the same unit for the 06 model and has a CARB EO #.

See my post: http://www.aveoforum.com/forum/f108/...verters-13572/ for more info. Ran me about $340 shipped. 06 is not listed on the EO for 06 model, as it was submitted to CARB before 06 model, but is the same cat application. The CAT must have a CARB EO just in case the tech looks for it. Otherwise 49 state 2-way cats will throw P0420 and may fail the inspection. Must use a 3-way cat. FYI