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Being an welder by tried, please be carfull welding on you exhaust system especially if it is still on the motor. A weld bee bee can travel a long ways inside of an exhaust tube, and do a ton of damage to an valve or an piston. Even welding with the exhaust off can leave carbon and loose wires and spatter on the inside that can get pulled in to the motor. please take the time to clean the inside of the tube and while you are at it take a die grinder and clean the weld penetration and smooth out the exhaust flow. Just some advice from an old welder that has built a lot of headers for a lot of different machines.
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