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E46 Engine Swaps
Replacing your motor? From direct replacements to more exoctic engines, if it's going under the hood of an E46 3 Series this is the forum to discuss it.

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Old 06-12-2019, 04:05 PM   #1
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Join Date: May 2019
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MS45.1 B30 Swap

Hi there,

So I am almost completed my engine swap from M54B25 to B30.

This is on a 2004 car that has MS45.1

From all the research I have done it seems that the B30 Engine will run OK on the B25 intake manifold, Injectors and throttle body. (Would prefer to use B30 intake with B25 injectors and TB, but TB wont bolt up.)

This is the only complete setup I have (TB, intake boot, MAF and intake)

Would there be an any issues beyond the slight power loss of this setup?

I am planing to swap to all B30 Components and Flash the ECU with a B30 file (or have BaliDwag do it) but it will take some time to get al the required parts (at an ok price)

Any input or ideas is always appreciated.

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Old 06-12-2019, 05:47 PM   #2
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Join Date: Jun 2017
Location: Collingwood Ontario
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My Ride: 03 325iT
May work ok.

If it was me I'd bite the bullet and get the last remaining parts.

Sent from my tractor.
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Old 06-13-2019, 11:57 AM   #3
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Join Date: May 2019
Posts: 12
I agree unfortunately cant seem to find a MAF for a good price.

Any thoughts if the B25 maf can be used? Would be able to get it ready with what I have.

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