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Although the n51 already comes with the 3 stage, it seems as though n52s that swapped out their single stage manifolds for the 3 stage seem to benefit more from it than n51's with tunes. Besides the lower compression ratio on the n51 what keeps the n51s down on hp/tq when compared to a similarly modified n52?
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2009 Alpine White E92 N51 328i Automagic | Premium & Sport Pkg. | Coral Red/Black Dakota Leather Interior | M-Spor | BMW Performance Exhaust | Active Autowerke Headers | BBS CH-R | CPS Front Lip | Performance Front Grills | 888Concepts Custom Headlights (GONE)
2011 Alpine White E90 N55 335i Automagic
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