The ECE-R59 approved system complies with the rules of the Economic Commission for Europe. Suitable for models with gas particulate filter (GPF) in the exhaust system. Vehicles with GPF NOT available in North America. Suitable for models with dual shift gearbox, automatic dual clutch (DSG) and manual transmission. This is a 3" diameter system. This system features bright chrome-plated T-304 stainless steel end caps. BORLA® Cat-Back™ and Axle-Back exhaust systems feature a patented straight-through, multi-core technology designed to unleash hidden power Exhaust velocity adds power, driving excitement, fuel economy and the distinctive BORLA® Sound of Power respected by enthusiasts. Every system is constructed from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the best in performance and durability Ultra-smooth mandrel bends ensure maximum flow and power, and computer-controlled precision CNC manufacturing ensures a precise fit.Best of all, BORLA® backs every system with a million-mile warranty.Exactly what that you att from the most experienced (and winning) exhaust brand in the world.