Sizetainless Sizeteel Sizehorty Header Compatible With 84 to 91 BMW 325/325E/325I/325ISize 6Cyl. Engine By OBX-RSize

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: 1.5" Port Shape: Circle  Port ID: 1.4" Collector: 2.2" Outlet: 2.0" Main Piping Size: N/A O2 Bung: 1 EGR: N/A Air Injection: N/A Flange Thickness: 3/8"