Stainless Long Tube Header Fits 86 to 91 320/323/325i 2.5L E30 By OBX-RS

welded construction for stronger hold  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: 1.6" OD  Port Shape: Circle  Port ID: 1.5" Collector: 2.3" Outlet: 2.0" OD Main Piping Size: N/A O2 Bung: 1 EGR: N/A Air Injection: N/A Flange Thickness: 3/8". T304 Fully Stainless Steel Dual T.I.G