View Full Version : Are all Supertrapp disc style USFS app?

07-04-2010, 12:14 PM
I have found I need a spark arrestor to ride where I've been riding. I have two bikes with 4" disc slip-on mufflers. One endcap is marked as a spark arrestor the other isn't. The one that isn't is much older tho. Is there a difference in the mufflers/ end caps? I looked at the end caps listed online, would I wan't the "lettered" end cap. Thanks.


07-06-2010, 07:15 AM
Yes, you would want the lettered end-cap. Have you looked at the lettering on the bottom of the muffler body? The 4" Aluminum Racing Series has the USFS approved stamping on the body. As long as you have a "closed" end-cap used with the discs as intended...it IS spark arrested.