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All us spec N51s have a 3 stage intake manifold. That's how they get the same power of as an N52 powered 3/128 even with lower compression.
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--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors |