I just got a pair of CMI "sound eliminator" mufflers. Are the clamps enough to keep them on? There is a small hole at the base on them and I was thinking on clamping them on then drilling a small hole so I could thread in a self tapping screw? would that be ok / needed?

How much were the mufflers, sounds like cheap insurance, use something that won't vibrate out.

The mufflers are used, so not big bucks. I guess not a lot use mufflers. So not much experience with them. Thanks anyway

Yes, self tap them on. I have a couple friends that each have 1 laying in Lake Michigan.

I just pulled my clamp mufflers off dry exhaust.

I had to really tap them off with my deadblow hammer.

I don't think they would fall off.

Peace of mind insurance if you drill and tap for a good machine screw.