Thanks Steve So a couple of the renesis yellow injectors to replace the red primaries might give us the headroom on those primaries. Just wondering if others using the 4 port injectors have had the same issue. Tracy, specifically mentions this configuration, so someone must have been using it. My troubled mind only gets more troubled when I think that our fuel rail is at 50 psi, which I thought might be higher than others maybe using and flowing more fuel. Steve Izett > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html