E46Fanatics - View Single Post - M54 3.0 to 2.5 Swap Will it work
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Old 06-29-2019, 07:24 AM   #2
Effduration
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Join Date: May 2017
Location: Boston
Posts: 521
My Ride: '05 330CiC
Haven't done it - Have swapped 3.0 to 3.0 but it should work. Intake and MAF are different. I would do the swap and use the 3.0 intake, harness, throttle body, MAF and see how it runs. then I would reflash the DME.

Consider rebuilding your 3.0.. those engines are a dime a dozen now, but won't be in a few years.
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