They are all good, but I went with Sato. I talked to Dan Kyle about the Sato vs the Akro Evo system and he got better power from the Sato with his PC III mapphat954rr said:I have an 05 ZX-10R and was wondering if anyone saw some good hp gains from a brand specific exhaust. My personal preferences are Yosh.,Micron,Acro. :beer