This is what I was told... apparently the burnt tips are new and the logo was changed. The single canister versus the double canister and different clamps. I think it is actually more of a blending of some of their previous designs versus a complete re-design; as I think all of these were available in some form on their previous models, but perhaps not all together.
ME: "If its just burnt tips and clamps why do you need a test fit?"
THEM: "Just to be sure"
Ok, fine!! best money I ever spent!!
Seriously though, this exhaust is super good for the asking price. Im really quite impressed. I hope I can work with them again... they mentioned I might need to come out for any changes that are made.