Borla offers their catback exhaust for the GT-R which features a completely true dual design. This system is constructed of full stainless steel and features 2.25" piping for an aggressive sound and great performance gains. The catback removes the secondary cat for added flow and gains, however this does mean it is not street legal and will not pass emmissions. It exits through dual S-Type mufflers for an amazing exhaust note that is not comparable by any other system. Each Borla exhaust is tuned for your vehicle and provides optimal hp and tq gains as well as weight savings over the stock unit. Borla includes their million mile warranty on this system, it is gauranteed to last the life of your vehicle.