Aluminized Steel 4 Inch Cat Back Single Side Exit 4 Inch Cat Back, Single Side Exhaust, Inch Built from heavy duty Aluminized Steel our Performance Series exhaust systems offer a value price without compromising on the quality built into every component.While the seams are a major point of rust through with some budget systems our fully sealed tubing adds years to your system. Constructed to the same specifications as our top of the line Pro Series we back this line with a 1 Year Warranty.Built to Perform MBRPs performance exhaust systems are