I can't comment on the Yonaka but I can recommend the Manzo.
https://manzousa.com/product/scion-f...xhaust-system/
I bolted one up to my Open Flash Header 10 years ago and it still sounds great.
The resonator blew out it's packing a couple years ago and I had to replace it with something else. (It pissed me off that Manzo would not sell just a resonator).
But for the price, it can't be beat.