TESTED! Real HKS Exhaust vs Dead match 1:1 Copy Replica | Is it really the same?

Well well, I've always ragged about how HKS Exhausts for diesels make zero power and here we have for testing a claimed 1:1 copy deadmatch replica! So we took a bunch of measurements, and of course dyno tested both the real thing and the copy!

https://www.youtube.com/watch?v=VJEB1sw9KCc