I think the issue with warping the valves is when you shut the tractor off. This is when cold air blows down the pipe. This is where a rain cap and a baffle in a muffler also serves a dual role to stop air flow down the pipe. Running a straight pipe on a M wont do anything for power, just make you hard hearing and make the tractor sound like it's not running right. The baffle in the muffler is for sparks, keeping them from flying out and catching something on fire like a hay field. The baffle is not for sound but it also can knock one or two horsepower off under a load holding back exaust pressure this is why some people look for a straight thru muffler with no baffle.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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