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      02-21-2011, 12:19 PM   #45
Fraser-Z4
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Drives: Z4
Join Date: Jan 2011
Location: England

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Hi Guys,

I've currently got a UK '2.5i' N52 with 177bhp, this already has a three stage intake manifold as standard, however the UK '2.5si' with 214bhp (both cars are 2500cc) also has a three stage manifold with a different part number - 11617559526 vs 11617559525. I'm guessing the one fitted to my car is slightly more restrictive (it is the only engine components with a different part number between the two engines), so I'm swapping it for the manifold off the 'Si'.

I'm looking for a used one but does it matter what mileage car the manifold comes from - is it a part that may wear out with age/mileage? I'm guessing not as it's got no moving parts - I'll be using my own DISA actuators.

Cheers