Yet ANOTHER report that the xis DO have the check valve... I also exchanged a message with Matt at UUC, along with a few with a guy who claimed he'd had it done on USENET. Matt said that he had seen it on SOME E46s but not others. :dunno:
Anyone want to help me root around for the CDV on my car? Seems like a fun way to spend a Saturday (not for a few weeks, though).