Intake Runners - Alfa Romeo Forum
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Intake Runners

your advise would be much appreciated.
I've managed to source some larger intake runners from a 3.0 24v and would like to know:-

Would it be possible to fit to 2.5 12v?
Is it an easy job?
Are there any specialist skills/tools req'd
Would it increase performance enough to be worth doing?
Affects on ECU?

A lot to ask i know.....
Many thanks in anticipation

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Re: Intake Runners

Don't quote me but from memory they won't bolt straight on as the angles are different...somet like that anyway.

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Re: Intake Runners


If it turns out you can't use them on your 155.....I might be interested in them for a 3.0 164 motor I have.
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Re: Intake Runners

Unless the breathing of the rest of the intake system is improved, air flow meter , throttle body etc i carnt see this would make much difference

I know the 156 boys are all looking to do this mod, but i think it would only make a difference once all the other stuff has been done. To get any real benfit you would need a custom remap ~ 4-500 quid
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Re: Intake Runners

Not sure about the 155 but the only difference between the 164 QV 24V and the standard 24V Super was the intake runners. The Super had 39mm and the QV had 45mm (if memory serves). The extra horsepower gain was 20 BHP from 210 to 230 BHP. Basically the engine was designed for the larger runners but was constricted on the Super in order to give the QV an edge and therefore a reason to buy one! I'm waiting for my runners from Italy as we speak/type. That in combination with a chip and the sports filter I have is good for 240 to 245 BHP (tested). Oh and the exhaust needs to be done too as what you do at the front you've got to do at the rear or there's no gain.

I know that the 156 can have larger runners and I believe the performance increase is good but I don't know if you can do the same to your 12V 155 engine. I really doubt it but try anyway, not a big job and you will see right away on the first runner you remove.

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Past glories: Sud 1.5ti, Alfetta GTV, GTV6, 33 1.5ti, 33 1.7ie, 164 3.0 V6, 164 3.0 V6, GTV 1.8TS, 156 1.6 TS, 159 2.4 JTDm QTronic.
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