HEY DAVE , ED IS RIGHT ON THIS , WE WERE USING THE 2.8 INJECTORS AND HAD TO GO UP TO JUST UNDER 18 PSI TO GET IT TO STRAIGHTEN OUT AND NOT HAVE S TUMBLE, ON TAKE OFF AND IT WOULD HAVE A LEAN SURGE AT LITE THROTTLE CRUISE , THE LARGER INJ WOULD I AM SURE REQUIRE DROPPING THE PRESSURE BACK DOWN..I MUS HAVE HAD THAT REG OFF AND APART A HALF DOZEN TIMES , SHOULD HAVE WENT AHEAD AND BOUGHT THE LARGER INJ , JERRY