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OBX Performance Exhaust Header Toyota Corolla AE86 4AGE 20V Tri Y Models. 5-15 HP Gain Through SUS-304 Stainless Steel Hi-Flow Tubular Design. Huge impact power gains. Dramatically increase throttle response and Extract Maximum Performance Gain. SUS-304 Stainless Steel Mandrel Bend for Ultra Fast flow. CNC-321 Stainless Steel Flange with TIG/ MIG Welding for Durability. 16 Gauge Runner Wall, 0.4" flange, 1.6" OD primaries pipes, 1 7/8" ID Collector Quality Mirror Polish Finish Stainless Steel Value Added Direct Bolt On/ Weld On Set Up Without Any Modification Dyno Tested and Track Proven at low end and top speed to Increase Torque and Horse Power Mandrel bend for ultra smooth fast flow Computer Numerical Control (CNC) machined 3/8" flange for precision fitment Dual Tungsten Inert Gas (T.I.G.) welding for stronger hold Increase Better/Smoother Exhaust Flow At Higher RPM To Generate More Power And Maximum Performance Out Of Your Engine. Great Power Package to Unleash Hidden Ponies From Your Motor. Get Up To 35% Better Exhaust Gas Flow By Replacing The Restrictive And Inefficient Factory Cast Log Manifolds With These Precision Built High Flow Headers. Backed by OBX Limited Lifetime Warranty against Manufacturer Defects Don't settle for the cheaper exhausts on eBay which are known to crack over time due to cheap welding, thin flanges, and very thin wall thickness. Also comes with a limited lifetime warranty from manufacturer defects.