JPR performance silencer for the zr 4000 is top of the line.  It uses all the stock mounts sounds amazing and only weighs 5 pounds.  Ceramic coated silver gold or black. 

At JPR performance. We flow test the stock muffler and make our can flow the same. This means no jetting and no power loss. 

Get the can you have been looking for to make you 500 braaaaap like a big sled.   

Thank you for your interest. 

Check out videos at 

Jpr1performance.wordpress.com