you are in CA.... its not the shop. unless it says its 50 state legal, which I doubt it is. you still have the issue the shop could loose its business license if it installs it and or also helps in removing the EGR. In CA dont you have to show that the old cat was bad to replace it? and it has to be same size and installed in the same location?
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)