PYPES Race-Pro systems are designed to deliver enhanced performance and maximum flow because of their mandrel-bent, 409 stainless steel pipe. Mufflers feature a straight through design that flows extremely well for high-power applications. At idle and low rpm cruising, you will not draw much attention, but upon acceleration, bystanders lookout! The Race Pro's aggressive sound is the result of applying a layer of stainless mesh around a unique internal perforated tube, accompanied by a healthy stuffing of basalt insulation before the unit is sealed. Systems come complete with stainless mufflers, tailpipes, hangers and plated clamps.