Magnettospeed V3 with Suppressor

I use the square stock spacer provided, it's prolly 1/4" or so bottom of suppressor bore to top of the sensor deck. Disclaimer: Mine is a V2 model. Magnetospeeds are awesome!
 
The instructions also explain how to mount it in relation to the bore opening. Suppressed or not it's the same, you just have to move the strap onto the can with the insulation so it doesn't melt the strap. Don't over think it.