DYNO TESTED TO MAKE THE BEST HP ON THE MARKET WE'VE TEST THIS PIPE OVER AND OVER THROUGH OTHER PRIVATE LABLE VENDORS, TRACK RIDERS, DUNE RIDERS. IT HANDS DOWN BEATS THE BIG NAME MOTO NAME PIPES AND IS BEST FOR PERFORMANCE MODS. WE'VE BEEN WORKING WITH THIS PIPE SINCE 1997 WITH SLIGHT TWEEKS HERE AND THERE THROUGH THE YEARS. ON PERSONAL & CUSTOMER USE AND STILL TODAY IT CONTINUES TO OUT DO THE REST. 
 
FOR STD BORE or BIG BORE( REQUEST BIG BORE  240cc PIPE) 
 
RAW WORKS FINISH WITH ALLOY CAN AND BILLET MUFFLER CAP. EASY REBUILD. 
INCLUDES PIPE COUPLER, AND EXHAUST FLANGE WITH SPRING.