This is an option when our Shorty application chart does not have a bolt-on fitment for your bike or situation. Right side exit Shorty black muffler 12 inches long, 3 inches outer diameter, with a very slight angle pitched out (aprox. 4 degrees). Measure the outer diameter to the .001 of the tubing you will be clamping the VooDoo Exhaust muffler OVER. Use digital calipers to measure. Minimum sizing of 2.25 inches inner diameter. Maximum sizing of 2.45 inches inner diameter. Do not use a measuring tape or ruler, they are not accurate enough. Example: GSX-1300R Hayabusa has an aftermarket full exhaust and you want a VooDoo Shorty Muffler. Remove the muffler and mid-pipe, measure the outer diameter of the outlet off the 4 into 1 collector where the muffler will bolt on. Make a mock up and check for clearance then place your order indicating the outer diameter specs in the notes section and include what exhaust is on your bike now, what make/model of bike. Your new VooDoo Shorty muffler is supplied with a clamp and will be manufactured to mount OVER your measurement given. NOTE: This part is non-returnable and non-refundable once sized to customer specs. Installer is responsible for fitment, clearances, and any support brackets if needed. Power Commander may be required for proper fuel management. Call if you have any questions and we will walk you thru itOffice: 1-(440) 653-5333