hey yeah when I had my cbr250 I did have the akra exhaust. To my knowledge it only comes in carbon so thats I had it. I bought it second hand basically new so at the price I got it for it was a great buy. It was definitely loud and improved the sound of the bike. As for performance, taking off the big stock muffler and passenger pegs help the bike maneuver better and make it lighter. Did I notice much more than the bike looking better and feeling lighter? Nope. But I would get it again.