The MagnaFlow 4" X 9" Oval XL Multi-Chamber 13288 features a straight-through, weight-optimized reversible design with a perforated stainless steel core featuring baffles and tuning gates, enabling it to deliver the powerful signature sound and dyno-proven performance thats made MagnaFlow a household name. Muffler 13288s oval-shaped, 4x9x14in. body and universal 3/2.5in. diameter inlet/outlet layout enables flexible installation options to match the spacing requirements of your vehicle. Professional installation is highly recommended. 13288 is produced using advanced CNC precision robotic manufacturing techniques and features durable, corrosion resistant stainless-steel construction, all backed by MagnaFlows limited lifetime warranty.