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Correspondingly, will running a tractor without a muffler hurt the engine?
Running without the muffler may have some effect on exactly how the engine runs. It will hurt your hearing a lot more than it will hurt the valves.
Keeping this in view, do lawn mowers have mufflers?
Lawnmower engines don't have mufflers so all the vibrations that it produces get transfered directly into your earholes. Your car has technology to dampen, out reduce, the sound. Lawnmowers have engines that are essentially expose on the outside.
a race car style exhaust system is a bad upgrade for a street vehicle. A straight pipe, for example, can cause exhaust gas velocity to increase. This will likely reduce engine performance below 2,000 or 2,500 RPM, making your vehicle a little slower to launch from a stoplight.