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100% Brand New Items, Never Used Or Installed High Performance 2 Piece 4-2-1 Stainless Steel Header Kit CNC Machined T-304 Mandrel Bent Stainless Steel Piping And TIG Welded Steel Flanges Made By OEM Approved and ISO Certified Manufacturers With Materials That Meets Or Exceeds Strict OEM Requirements Direct Bolt-On Item; No Modifications Required Improves Engine Performance And Increase Horsepower By Significantly Reducing Exhaust Flow Restriction Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. Specifications (Estimated): Inlet: 1.9" Oval Outlet: 2.5" NOTES: * O2 Simulators May Be Required If A CEL Is Triggered * No Installation Guides Are Included, We Highly Recommend To Seek Professional Installation FITMENT: 1991-2001 Infiniti G20 1995-1998 Nissan 200SX 1991-1993 Nissan NX 1991-2001 Nissan Sentra[ Attention: Will Only Fit 2.0 Liter Engines ]