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Hi Austin, The only way to know, of course, is by a dyno test, and I have no specs or data regarding HP figures either way. HOWEVER, I doubt a dual exhaust setup would LOWER the Horsepower but probably RAISE it slightly, just based on the very basic assumption that anything that lessens the energy required to push the piston up to expell the exhaust increases that available elswehere (like on the drawbar or pulley). THIS IS A PURE GUESS but I would be suprised if it raised the HP much over 5% if that much or any??? If it raised it say 7 to 10%, looks like that would be major and would have been a JD factory offering. I have read about tuned exhaust systems that are fairly complicated and based on flow mechanics and all sorts of deep mechanical n engineering considerations for high horsepower extremely high RPM V8 engines etc., but at 1000 RPM and only 2 cylinders and the already fairly open exhausting area/volume (compared to complicated tuned headers) to begin with, I just dont see a dual exhausted JD gaining that much HP over stock?? Still a fun question for duscussion, sorry I have no specs or data or actual tests to reference, maybe some mechanical engineering types (Im Electrical) or those with some data or flow tests etc can give you the definitive answer youre lookin for. It will be fun to learn about this topic. Our friend Duane Larson might have some data or field tests on the subject????? Have a good day, God Bless Yall John T
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