E30 & E34 with swap M50 M52 S50 S52 engine Description: T3/T4 Flange 3mm Thickness 42mm Piping OD ,polished surface treatment,Special for Racing !!! Diameter 42mm., wall thickness32 Gauge (3.0mm) • Complete high-quality stainless steel (AISI 321) for pipes.; • Double-sided welding...