All our jets are the same price whether they're Main Jets, Idle Jets, etc. The price shown is for a set of 6 jets.  Just tell us which kind and what size. Sometimes the Jets, Venturis and E-tubes are sized using a trial and error method. There's just too many variations between Porsche engines to state absolutely that a particular combination of Jets, E Tubes, Venturis, etc. will be perfect for your 911. Sometimes you will need try different jets, etc to see what will work the best.