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m20b20 to m20b25

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    m20b20 to m20b25

    Would a m20b25 bolt into a e30 320i? are the mounts the same? what would i need to change? Driveshaft? Gearbox? and such, any info would be great :)

    #2
    my car is a 1988 320i with m20b20 and swapped to m20b25 a while back.

    Believe everything bolts in, tranny, engine mounts. I also swap in B25 harness, AFM, matching intake tubing, idle control, and AFM.

    I think there is one wire going to one of the relay next to airbox need to be cut, but forgot which one. (1st time i turn on ignition, that wire fried itself). I cut the car and everything worked. Still havn't figure out what that wire does.

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