Intake manifold - Alfa Romeo Forum
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Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

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  #1 (Post Link)  
Old 14-10-11
yeew's Avatar
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Alfa Romeo 156 V6 2.5

Intake manifold

Anyone got a quick tips on putting the intake manifold off at 3.0L v6 and putting it on a 2.5L?
Do they just fit straight on like normal?
Thanks
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Old 14-10-11
Alexandrus
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Fits fine, but it's the exact same plenum, only difference is the intake runners being a bit larger diameter.
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Old 15-10-11
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Cool thanks. Does it actually make much difference?
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Old 15-10-11
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it may, slightly.
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Old 15-10-11
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The 2.5 plenum is exactly the same as the 3.0, no point changing it at all.

By all means fit the chrome runners & base plates from the 3.0, but you may as well use your existing plenum.

CF2 & CF3 plenums have the breathers in different places but there is no internal difference or size change.
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Old 16-10-11
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Cool, thanks, I'm going to get a remap sometime after it to get the most out of it
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