CAI stands for "Cold Air Intake" option. TPW is an additional item to the event code(s) which stands for "Tentative Production Week". There are a couple of previous threads which show the list of "event codes" ie 3000, 3400 and their respective meanings. The codes changed around Easter time (they used to be only 2 digits) when the mfg plant/dealers converted from the Saturn to GM order management system.Golf Sky said:I am a little confused about all the acronyms used by forum members, such as CAI, TPW, the numbering scheme (3000, 3400, etc.), and others. Is there a previous thread which provides explanations?