dealer put in new massive air sensor took car out, problem! banks 12&3 are lean & bank 45&6 are rich at idle. 2500 rpm it reverses Bank 123 is rich & bank 456 is lean engine & lite is on. dealer changed dme & checked for air & vaccum leaks,oxygen sensors, same problem! called porsche tech at porsche said to take out k&n filter, polished manifold with splitter, zuk z airbox, big bore throttle bodies & unichip. or take car to the racers group or s car go, they should be able fix? at 2500 rpm engine drops 2 to 3 rpm for a second. any suggestions

 

went to breakfast with diablo pca & was told, when i changed to the rsr muffler i should have my unichip reprogramed? just called robbie at s car go , told me no problem. let you know what happens next week.