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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 05-21-2010, 11:52 PM   #1 (permalink)
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325i intake manifold versus 328i intake manifold

Ok, so I'm still trying to learn engine codes, etc for these cars, so if I get this wrong, I apologize! I have a 1998 328i, and if I'm not mistaken, I have an M52B28, and the 325i has an M52B25 engine. I've heard the intake manifolds on the M52B25 are better, and less choked off. I am thinking of doing this swap and would like to know what all is involved in this. I have searched, but it came up with a lot of links that didn't do much for me (and it could also be I suck at searching). I think I read that there is a conversion kit to do this? Thanks!
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Old 05-22-2010, 12:03 AM   #2 (permalink)
OMFG another one!?
 
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Old 05-22-2010, 07:08 AM   #3 (permalink)
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The 325i's engine is the M50B25, and you're right that the M50 manifold is more free-flowing than the M52 manifold.

A DIY writeup:
Modifications

Link explaining the M50 manifold swap and links to two more DIY articles:
Official M50 Manifold Swap Thread - Bimmerforums - The Ultimate BMW Forum
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