SP Tadao Power Box Short
I bought it for sound and looks. With the stocker, full face helmet and surrounding noise, many times I can't tell if the bike is running. Probably like many others, I listen to the engine to know when to shift and also to keep from stalling on take off. This bike is so smooth that I can't go by vibrations. ( Not a complaint by the way ). One of the biggest reasons I bought this bike is because it runs so darn smooth. I love the quietness of the stock exhaust but needed just a little more sound for driveability.
The SP is not loud but has a deeper throaty sound than stock. No increase or loss in power as far as I can tell.
I like the look of it. It tucks in nicely on the side and isn't as big as the tree trunk stock exhaust.