Originally Posted by GlennF33
I did the mod using a 1 1/8 dia. extension hole saw I had. It is louder than stock but pepped it up quite a bit. Some riders have opened up the baffle to almost eliminate it. I think that is un necessary as the headpipe is only about 20 mm ID.
Start with a 3/4 drill and see how you like it.
i heard 3/4 will do it and not be as loud as full mod...dont know myself tho'
dirt bikes, vstrom, cruiser, etc.
"what hurts, instructs" - ben franklin