Hehheee.....yep, Akro it is.
But seriously, I'm not brand loyal.
Akro doesn't make the most HP because I own it, I own it cause it makes the most HP.
The HP differences are so small though between the top brands , that it comes down to Price, looks and fit. I dont know about Muzzy and Sato, but Akro fit much better on my bike than Ti-Force did. I had a Ti-Force pipe on my bike first and it required minor fairing trimming and two spacers to get it to fit right without melting panels. The Akro required nothing, perfect fit.
The other reason I bought the Akro was because Kevin Blais from Blais cycle promised me that if the pipe didnt make good HP numbers, he'd take it back, no charge.
Cant beat that.