Missing piece on my intake manifold

[Mike Fishwick]

If you know someone with access to a lathe, a replacement could be easily made to the pattern of an existing piece, from plastic, aluminium or brass, so long as there woulkd not be a risk of it being ingested into the engine.

Its function is to accelerate the intake air when the throttle is almost closed, so increasing turbulence and slightly improving combustion. I doubt if you could tell the difference with one missing anyway.

 

[Andyboy]

It will be a 2.8 M52TU or 3.0 M54. My guess is a 1999 MY or 2000 2.8.

The missing bit is a guide tube for the secondary air supply, basically an emissions thing. It doesn't really matter but it would annoy me not being there. A manifold will be cheap, shared with an E46 328i or E39 528i from 9/98 build.

If it's a 2.8, buy yourself a 3.0 manifold and an adaptor to fit the 2.8 throttle body, and win yourself another 15 bhp or so.

Adapter | M54 330i intake manifold upgrade on M52 TU

Throttle body adapter for fitting M54B30 intake manifold on double vanos M52 engine. Get more power from your engine with M54 manifold conversion.

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