The Mack And Volvo 12.52 Inch Long Stainless Steel Insulated Exhaust Pipe with 4 Inch Diameter is a practical and reliable solution for your vehicle's exhaust system. Made in the USA with stainless steel construction, this exhaust pipe is built to last. It is directly replaceable with OE parts, making installation hassle-free. With a length of 12.52 inches and a diameter of 4 inches, it fits most Mack and Volvo makes and models. The exhaust emission norm of EPA 10 ensures compliance with environmental regulations. Clamps and gaskets are included for added convenience. Direct OE replacement numbers are 21478681 and OTR8CA003.