I installed mine today and couldn't get it to fit right because of the splash guard and brake duct so i ended up modifying it like this one. If anybody with an m44 is wondering how to do it. I was lucky enough to have one of these in my dads shop
http://www.geocities.com/industrialm...rill-Press.jpg I used 4 bits after marking a hole going up a size with each cut until i could fit the grommet for the sensor in.
Any machine shop should have one and it only took 5 minutes so I'm sure if you asked somebody they would do it for free or for a very small fee.
And the small bracket that the relocated horn was attached to can be hacksawed off very easily and bent backwards or removed completely it made it easier to fit the filter and maneuver it around