airbusdrvr,

If it is the Speed #1024, some were drilled and tapped. They utilized the same hole spacing as the OS #744, Rossi 60, and Fox Eagle 3. I believe there is an Enya that shares that hole spacing as well. Others needed a Strap- on like the BCM Lou mentioned-- that one works fantastic. I have some of each version of the Speed .61

8178 is correct about the K&B muffler working on the Blackhead / Silverline .61's( 10cc). They also share common spacing with the HB 40-.61, ST 45-60BB, as well as the K&B .61 and .65 Sportster.

turbo