[jjflash]

Originally Posted by Danglerb

Given the car you are looking at, I say LEAVE IT ALONE, drive it a few months before changing anything.

I got some clarification from the owner of the car I'm considering on this. The car HAS the X-pipe with no cats and an RMB already installed. Seller has the factory cats stored and would return the car to stock condition for smog. Then I could reverse the procedure and put the stock stuff away until next smog check. Apparently nothing is welded up and it a matter of unbolting, bolting and putting the air pump back on.

So it appears that I could either drive it with the stock equipment OR put the X-pipe without cats back on, without a major hassle (no welding/cutting).