CF2 Manifold onto a CF3 - removing front cats. - Alfa Romeo Forum
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CF2 Manifold onto a CF3 - removing front cats.

Am i tight in thinking that the CF2 manifolds dont have any cats?

What sort of BHP increase (with remap) do you think this mod will make?

Is it a straight swop? Plus will there be any changes in noise levels - if so, why arnt CF2 cars more noisy that the CF3's? Are the silencers bigger?

Thankyou.
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No Cats in CF2 manifolds, but what engine?
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Manifolds will need to be drilled and plugs welded for the lambda sensors,cf2 156 downpipe will have to be used as well as cf2 156 cat and then of course remap.

We use to do this all the time,not a bad little mod.
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No Cats in CF2 manifolds, but what engine?
I have a 147 CF3 2.0 TS. What is the differance between a 147 CF2 manifold and the 156 manifold? Will they be a straight fit onto my current exhaust?

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Manifolds will need to be drilled and plugs welded for the lambda sensors,cf2 156 downpipe will have to be used as well as cf2 156 cat and then of course remap.
Can the ECU not be remapped not to monitor the sensors at all, so the sensors can just be unplugged and removed?

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We use to do this all the time,not a bad little mod
Any idea of the gains?
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I think all 147s are CF3 - so to go CF2 you need to use 156 manifold, downpipe and cat - not a particularly cheap option even second-hand....and you'll need to find a way to join it to your existing exhaust system.

No idea if you can remap the ECU to ignore the missing lambda probe signals....
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EDIT just seen its a 2.0 so not sure if similar gains could be made.


I've been running a CF2 setup for two years now on my GTA. It resulted in a gain of 20bhp on standard. No remap required it ran fine as it was. I had it mapped and only gained another 3-4bhp.

The main issue is the pipe from the manifolds to the centre cats. You need something custom as standard items won't work. There are plenty of places doing them now though
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