This is Precision Raceworks 601-0121-b N54 Forward Facing Manifold **B-Stock**.
N54 PERFORMANCE FORWARD FACING INTAKE MANIFOLD is designed to work with both 335i and 135i BMW's that came with N54 engines. This is a perfect way to add reliability while increasing air flow, adding port injection. Best of all our kit comes with ports to add direct port meth or direct port nitrous!
Please Note: For the B-Stock manifold, during manufacturing the flange was welded at an incorrect angle, and as a result, the included spacer/adapter plate is REQUIRED. Additionally, these may be incompatible with phenolic spacers.