So i ran my P5xlt and swopped the 9901 pipe for the 9886 and although i did not notice much top end performance, the run time was good at 11:30 with a bit to spare in the tank. Air temps are 8 degs cooler then our summers so will be intresting to see what happens later in the year. Running the stock venturi on the motor (6.5). Will post how my first race goes with this pipe.