Don't Doo pipes say Doo on them somewhare? all there is is that littls welded X just inside of the bend. Maybe they just say Doo on the insulation wrap which I guess yoiu are saying has been removed on this pipe and it has been coated instead... correct?
Looks like the HPS can is in great shape. The pipe looks like the Stocker that has been cut and welded. Bikeman Performance has done a few. More power?!?! maybe, the can does sound good IMO.
Doo pipe for sure. Those #'s on the spring holder will coincide with the last digits of the part number for the pipe....have fun, they're great machines