E46Fanatics - View Single Post - Whats needed to swap from B25 to B30 intake?
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Old 04-21-2019, 07:21 AM   #20
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Join Date: Oct 2015
Location: Germany
Posts: 193
My Ride: 325i
So, there should be a difference in every piece you have there for the conversion. The runners are shorter at the b30 manifold, while the “chamber” in front of them is much wider. The b30 Disa Unit has also a longer flap, so it can close the bigger chamber at the manifold. And the TB... should have an 3 inches diameter or so.

No parts should be compatible with the b25 intake

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