+1BDE No Questions.....
I picked up a very conservative 12hp with the Yosh TRS and an Intake cam in the exhaust. Plus bike lost some serious weight over stock cans/system.
Yep powerwise its going to be too close to call. Its more about the look, sound, and fit you wantI'd say Yoshi, but I can't prove it.
Depends on which yoshi system and which akro system.
In reality, it'll probably be so close, there won't be a significant winner.