super 99 muffler

The factory muffler is obsolite. If you can find an old book you can make one. The inlet is 3.5 " and outlet is 2.5" with built on rain hat. i found a riker muffler with the correct backpressure and inlet size but the outlet is 3.5" looks close but not exact. Duane o.
 
https://www.allpartsstore.com/ItemDetl.htm?B2BSessionID=131203088934832&CategorySeq=S&SelcBrand=MF&SelcMachn=TRACTOR&SelcModel=1100&SelcSectn=EX&SelcSubsc=EX10&SearchItem=1&TextSearch=&ItemNumber=510634M91

Here"s the one I put on my 990. Most any Ag implement dealer is an A&I dealer and should be able to order it. As you can see the original application is for a Massey but the 3 7/16" inlet fits the 3-71 Detroit exhaust manifold perfectly. The inlet pipe is a little longer than original but the other dimensions are pretty close. Sounds real good too.
 
I made one, 3.5" inlet, 3.5" outlet, 16" shell length, 7" shell diameter. I scaled it from the photo in the front of the operators manual. the outlet should be 2 5/8 - 2 3/4 as far as I could make out, but I made it bigger because it would have been a whole lot more work to make it smaller.It wasn't a 2 minute job either!
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