I removed mine, they are now straight through.
The front disc which is in front of the silencer does not have any holes in it at all!!!
The noise is now 98db at 2/3rds rpm measured 1 meter from the tail pipe. As per MSA rules.
But the sound is deeper, harder and more edgy, like it means business. I certainly can't creep up on any one driving it.
Get a 44mm hole cutter and whip the front ones out as well. You won't be dissapointed.
