yes the end of the pipe is out side of the tail just a bit maybe a 1/8 inch and the opening around the pipe is very tight about a 1/4 inch, so how far would you say to side the pipe back inside the tail and in doing so should i keep the gap between the pipe and the turbine at around an inch ,moving the pipe in makes alot of sense to create a suction from the exhaust i think it may have been inside about a half inch or so and i slid it back some as to like you said avoid heat inside the tail i will check the f-5 i have and see how far the pipe is in it as it is an open install also and i don't have a heat problem with it if i remeber right it is not inside the tail cone very far at all thanks for the help