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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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