Best pipe for kb 21 outboard

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I've run the old Irwin pipe for years. I just ran Jim Irwin's latest 3.5 quiet pipe on a CMB green head, and it worked very well. I understand that the Hopper Silver Bullet pipe is good as well. It has a smother power delivery than the old Irwin pipe, acording to my friends.

Lohring Miller
 
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