Open up the exhaust hole in the muffler as large as what the deflector covers. You'll then want to remove the limiting tabs from the carb needles and re-tune. They may make up the difference you're looking for.
An equally good reason to run full comp chain on a 25" instead of a 32" bar is sharpening fewer cutters/depth gauges.The best reason to pick up a skip sequence chain in that length is because it's easier to sharpen...
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