yep thats what i do, my yfz with the drag pipe is 100+db, and i have no clue what my cpi oofs are...
im going to make a rig to carry both my quads on my truck, they will still check for sparkys but not sound.
ive never been checked for sound in the last 4 years, and ive even gone threw with the drag pipe on, just make sure somone is getting checked and pull through.
hope this helps, you guys should go on the banshee hq weekend ..