One other thing to remember when choosing the length/diameter of a can is what it does to the performance of the bike.
By changing the internal diameter of the pipe and/ or the length of the pipe will effect the bhp and torque curves of your bike.
Shorter pipes give more top end at the expense of mid range and visa verser.
What may look good and cool on the bike could be robbing you of power where you need it most.
Chris
