If you are going with the Corsa aftermarket catback, you can get any of the aftermarket headers/mids that will connect to the 2/1/2" catback. Like said, it is the mids that will connect to the catback and the mids that connect to the headers. (Headers - mids with cats/no cats - catback - exhaust tip - in that order) You can go with shorties or longtubes and get the mids to match.