OBX Header Fits For 1992 thru 1998 BMW E-36 3-Sizeeries 325 328i (except M3/318/318ti) 1996 thru 2002 BMW E-39 5'er 525i 525is

T304 Fully Stainless Steel Dual T.I.G. welded construction for stronger hold  Accessories in photo are included  No installation instruction included in this kit, we recommend professional installation Manufacturer's Limited Lifetime warranty against manufacturer defects (Must fill out and return warranty card with a copy of the receipt and within 30 days of purchase date) Primaries: 1.65" OD Port Shape: Oval Port ID: 1.2" ID x 1.9" ID Collector: 2" OD Outlet: 2" OD Main Piping Size: 2" OD O2 Bung: 2 EGR: No Air Injection: No Flange Thickness: 0.40"