156 with 24v 3.0ltr v6 exhaust problems - Alfa Romeo Forum
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156 with 24v 3.0ltr v6 exhaust problems

I have the GTV engine and manifolds fitted to a 1999 alfa 156.
Its very quick but the exhaust is not suitable.
I have the standard 2.5 downpipes into a decat into a autodelta stainless middlesection and backbox. This was a much better improvement than the standard system, but I feel it is still too restrictive as well as far to loud.

I want to get a custom one made, but I dont want to spend 1,000's for a haywood and scott one.
So what are my options?

So far the best idea I have is to use the GTV stock downpipes (to be easily replaceable) and get a custom exhaust made up to the right diameter.
I'm in SE London, any advice what to ask for and where to go?
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(Post Link) post #2 of 10 Old 24-10-12 Thread Starter
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Did I post this in the wrong section?
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Did I post this in the wrong section?
I think so, should be in "tuning" but I think it's a rare question too, thus no replies.

Try equal length front pipes, it tends to quieten and even out the reverberation throughout the system leaving a more uniform engine/exhaust note. It releases a few horses too.

Custom built exhausts can be had from as little as 350 depending on where you go
 
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You could try Powerflow as the obvious option, theres bound to be one near you... Exhausts - Custom Stainless Steel Exhausts - Powerflow Exhausts - High Performance Sports Exhaust Systems.

Or try posting in the London or similar section of the forum
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The GTV V6 CF2 manifolds are the same as the 156 V6 CF2 manifolds anyway, with the exception that there is a lambda boss welded into the rear manifold just after the collector on the GTV V6, you don't need this if you are using the original 156 V6 CF2 ECU. 156 V6 CF2 uses just one lambda, (GTV V6 CF2 has two, one on rear manifold and one on front front-pipe). On the 156 V6 the single lambda sensor fits in the front section, just after the pipes from each bank merge together. I guess this is your current set-up if you are using the 156 V6 front pipes.

Presumably you have blanked the lambda boss in your GTV V6 rear bank manifold up already?

From memory the outlets of the exhaust manifolds are 2.125" so ideally you want front pipes made up that are the same diameter as this, then have them collect into a 2.5" system from there to the end of the car. It would be beneficial if the measured distance from the collector on the exhaust manifold to the merge point can be the same for both banks although this is difficult to do and still maintain good ground clearance. But I wouldn't worry too much, this only really helps the sound quality and torque at low revs (scavenging).

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Last edited by Pud237; 24-10-12 at 16:11.
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Hi guys!
I will reactive an old post, im having a problem, my alfa 156 2.0ts is gripped, the engine not found anymore, the block is broked.
I will try to install a 3.0 v6 24v engine in my car, is this possible?
What is gonna be my bigger problem?
I have to change the gearbox?
The ecu?
Radiator?
Im so sad, wait for your answer.
Thanks a lot!
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Originally Posted by Matias_156 View Post
Hi guys!
I will reactive an old post, im having a problem, my alfa 156 2.0ts is gripped, the engine not found anymore, the block is broked.
I will try to install a 3.0 v6 24v engine in my car, is this possible?
What is gonna be my bigger problem?
I have to change the gearbox?
The ecu?
Radiator?
Im so sad, wait for your answer.
Thanks a lot!
The radiator is the only bit you can use.
Everything else is different

Changing from a TS to a V6 is a big job, doable if you also have a V6 156 to use for parts.
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Yeah, as well as needing a 3.0 24v engine you will need a 156 2.5 V6 24v complete car to be able to get it fitting and working in a 156 2 litre.
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I'm aware of that, my main question was whether enters the compartment, especially by the supports. I understand that I have to change the ECU, exhaust system, probably gearbox, etc.
I thank you for your response.
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Quote:
Originally Posted by Matias_156 View Post
I'm aware of that, my main question was whether enters the compartment, especially by the supports. I understand that I have to change the ECU, exhaust system, probably gearbox, etc.
I thank you for your response.
Yes it is possible.
Other people have already done it.

But as well as all the mechanical bits you also need to change the wiring harness and the main dash display.
What you are really doing is reshelling a scrap 2.5V6 156 into your 2.0TS bodyshell.
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