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Old 01-21-2013, 07:28 AM   #8457
GlennF33
Gnarly Adventurer
 
Joined: Oct 2009
Oddometer: 111
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.
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