Add power and sound to your Elantra GT Sport with this Twisted Steel down-pipe which produced up to +12 HP and +26 lbs. x ft. torque gains on our in-house dyno. 100% hand MIG-welded 3" mandrel-bent, 304 stainless steel tubing for optimum flow, resulting in added horsepower and torque. This down-pipe is designed using high quality laser cut flanges for maximum strength and durability. This direct bolt-on down-pipe requires no cutting or drilling and includes quality hardware for a hassle-free installation. This down pipe is constructed of 3" mandrel-bent, 304 stainless steel tubing for maximum flow and corrosion resistance. High quality laser cut flanges mount directly to OE mounting locations for a leak-free sealing surface. Designed to be a true bolt on system with no cutting or modifications required. Quality hardware is included for a hassle-free installation. Twisted Steel 3-1/2 IN to 3 IN 304 Stainless Steel Street Series Down Pipe BMW X5 M (F85)/X6 M (F16/F86) 15-18 V8-4.4L (tt) S63 BMW X5 M (F85)/X6 M (F16/F86) 15-18 V8-4.4L (tt) S63