- MarteliusBMW E21/E30 4-cyl 1.8/2.0 4-2-1 XL exhaust manifoldFor the M10-type engine. Pipe diameters (mm) 44.5-> 50.8-> 63.5. Designed for race use with wide power range. Mild steel with Thermal isolating TechLine BlackSatin ceramic coating. Lamda sond bo€585.00