Two Brothers Exhausts

Just been looking into exhaust systems (both slip ons and full systems)

Been seeing alot of Two Brother exhausts about and it got me wondering really what they about.

American maybe but do they give you much in the way of ‘Helping your bikes performance?’. Are they a force to be reckoned with by the like of Akrapovic and Yoshi or are they yet another exhaust company out there that really only gives you a much fruiter sounding bike?