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      10-05-2012, 05:47 AM   #21
CombatNinja
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Drives: e91 328i, e90 328i, e90 335i
Join Date: Feb 2011
Location: United States

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Sure you can use downpipes, right after you execute an N54 swap.

This piece is just a fix for N54 guys running catless downpipes. It tricks the system into thinking everything is normal with the oxygen sensors. Should work on our cars but consult BMS. I know the same concept won't work on the N55 for some reason.

FWIW, I predict 12whp peak and +20whp above 6000rpm once these are on the dyno.