Mufflr 3" Rpt Chrome 17-19FlRPT 3" Slip On MufflersThe RPT slip ons make use of all of the high tech features of Cobra's regular 3" slip on mufflers, including 2" constant velocity cores for exceptional sound and performance, as well as bonded e glass and stainless steel mesh The RPT designation comes from adapting the design of Cobra's Race Pro 4" muffler into this 3" size The bodies begin as 3" at the front until they expand to 3 1 2" at the rear Tip is the Race Pro machined