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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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