Pacesetters O2s and EGR/AIR; couple Qs
As for the EGR/AIR you can take them out, but you'll get an SES light for that too until you get a tune to delete them fully. It's usually recommended you keep AIR if you have cats. They tend to clog up if you take out AIR and still have cats. I'm sure you know you'll need block off plates if u don't have the race style headers.

