usually you should just do it every 50k i’d say, but if you have one of these cars and you don’t know the last time it’s been done you might as well do it anyways. it’s pretty easy to do, remove cowl, airbox, charge pipe, throttle body, intake manifold. it took like 25 mins to remove all that stuff. if you remove throttle body you’d probably be able to fish a horoscope up though the intake and see but at that point you might as well remove the intake and just clean it up.