On the HF dust collector, the outlet of the impeller housing is about 6x4 inches, then gets choked down to a 5 inch round house. Not a huge choke, but a choke none the less. On an Australian woodwork forum I read about someone that replaced the round hose with a rigid adapter that matched the dimensions of the outlet on the impeller housing.
https://www.woodworkforums.com/f200/.../2#post1659193
Has anyone on here tried that, and if so, HOW, and what did you think of the end results?
I got a "page not found" on that link?
https://www.woodworkforums.com/f200/generic-2hp-dc-171247/2#post1659193
Woodworkforums.com>Hand tools & machinery>Dust extraction>The generic 2HP DC>post number 21
See if that works