E21 M20 Manifold Set
Description
Based upon Hartge’s original H23 exhaust manifold, our E21 M20 manifold set is constructed in T304 stainless steel and benefits from improved collector design. The result being a 7% improvement in flow when compared to the H23 manifold and a24% increase in flow when compared to BMW’s factory effort. Our manifold set is designed to cope with 3.1 litres of displacement, revving at 8000 rpm – so is suitable for whatever displacement and specification of M20 you choose to fit to your E21.