I just installed my new CFM airbox. I really like it. I put a silicone intake reducer on it as recommended. Only thing I can see is it will be a pain when I go to plug chop. It was a bit challenging getting the boot on. It will be difficult to remove carb without removing the entire box. Oh well. As for the mount that sits in the frame, all I did was use a large fender washer to span the rails. Also put a neoprene washer between the washer and the frame to secure/protect the frame better. Box is solid.