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I measured the muffler on the 122 ( which looks identical to the one on my 125 ) and the measurements are as follows

3-1/4" diameter main muffler body
11-3/4" length of main muffler cannister
15-1/4" overall length of muffler with tip

"pipe" coming out of the k301 is 1-5/16" ( 1.3125) in diameter at the muffler end. I averaged this out as it actually measured between 1.280 and 1.335 in diameter.

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