I have 2 used Street Series Mufflers that feature a free-flowing, straight-through perforated stainless steel core, with stainless mesh wrap and acoustical fiber fill to deliver that smooth, deep muscle car tone. These are the mufflers that come with the Cobra IRS catback from Magnaflow. They have about 50k miles on them off of my FL car. There is a small dent in the non-pipe side of one of the mufflers. $100 shipped.