I have had a stockman running on my 90 for over a year
This pic shows it stock with a hole and a tube to silence it.
I could not get it to work eather.
SO....I took the tube out and redrilled the hole on top and now works fine.
Its running about 1500gal through it and you might be surprized in the size of the hole.....I drilled and tested then drilled larger then tested....@ the rite hight its almost silent......
these were my first attept.........went very wrong........
Hope this helps.......

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Richard
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My wife believed me when I told her it was only going to cost about $500.00. that was over two years ago and I'm still grounded.....