i saw that earlier.. i have a friend with a welder.. what type im not sure but thats what he does for a living so im sure if i design something he can weld it for me.. is there any certain volume needed for the canister? what works best? also what did you do to match the start of the header to the engine.(where it screws in) does the poulan have a round exhaust port? and one final question what type of performance would you get with a 46 poulan on say a 15-16 pound sport plane? looking for good vertical.. thanks