Matt has the engines and mufflers with the O2 sensor in stock. I put 2 O2 bungs in the collector of my header. One for Kohler's ECU and one that I could use my own O2 sensor in if I ever got ambitious enough to try and do a custom tune.
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ADAIR TRACKS, WITHOUT 'EM YOUR JUST SPINNING YOUR WHEELS
REMEMBER KIDS, THE FIRST "A" in AATV STANDS FOR AMPHIBIOUS
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