Hi Mike,
what do you intend doing about the great big exhaust air pump unit on the M54? I know it's to do with emissions control by pushing exhaust gases back to the intake for a second burn but I've never really looked into how necessary it is as my M50B25 engine doesn't have one for some reason (2001 reg). The M54B30 I've just pulled does have one but it's a big lump of kit to try and find a home for in the sportster/cabrio engine bay.
Do you know if the system can just be removed and blanked off without either the DME getting upset or the emissions failing at MOT?
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