This is a "True Dual" racing system which eliminates the secondary cats and is intended for off road use. BORLA® Performance delivers super performance for Nissan's GTR. A truly unique offering, BORLA® PN12658 is the only "True Dual" racing exhaust with X-pipe on the market for this twin-turbo V6 all-wheel drive rocket. BORLA's 2.25" exhaust features"True Dual" "S-type" mufflers, which eliminates the secondary cats,for enhanced flow and performance. Patented technology offers more power when you want it, improved fuel economy when you need it. High-quality austenitic stainless steel is high on looks and durability yet low on weight, for more spirited driving. This system is for competition or off-road use only. From the design characteristics of the inner cores to the amount of sound-absorbing composite filament, all specifications of BORLA® exhaust systems are tuned on a vehicle-by-vehicle basis for an optimum blend of performance and sound. Combined with an unrivalled Million Mile Warranty, distinctive motorsport styling and easy bolt-on installation, the world's most winning exhaust continues to lead the industry it founded over 30 years ago.