Borla Cat-Back and Rear Section exhaust systems feature patented straight through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power; driving excitement; fuel economy; and the distinctive Borla Sound of power respected enthusiasts everywhere. Each system is built from premium 300 series austenitic stainless steel; superior to T-400 series knockoffs; to give you the absolute best in performance and durability. Ultra smooth mandrel bends ensure maximum flow and power; and precision computer controlled CNC manufacturing ensures an accurate fit. Best of all Borla stands behind every system with a Million-Mile Warranty. Just what you would expect from the worlds most experienced and most winning exhaust brad. GTI 15-18 2.0T AT/MT FWD 2/4DR S-TYPE S RD RL AC SR 2.5in.;2in. TIP: 4in. RD X 7in. Million Mile Warranty 2015-2017 Volkswagen MK7 GTI 2.0L 4 Cyl. Automatic/ Manual Transmission Front Wheel Drive (FWD) 2 & 4-Door. Does not fit MK7.5.