33 16v stainless steel exhaust - Alfa Romeo Forum
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(Post Link) post #1 of 19 Old 15-05-16 Thread Starter
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33 16v stainless steel exhaust

Hi all, sorry if this has already been discussed but i'm new to the 33 and am looking for a supplier for a stainless or performance exhaust system for my 33 16v. The only performance exhausts I've seen so far are the CSC system which is near £1000 for full manifold/system. Do you guys know of any alternatives? Also can any good 33 specialists online for parts etc?
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Are you looking for increased performance or just a stainless steel replacement exhaust?

If you are just looking for a stainless exhaust system then you should be able to have one made at one of the generic stainless steel exhaust companies such as Powerflow etc. Most of these types of companies will merely just replicate your existing system in stainless steel and are unlikely to give much in the way of power increases as their products are not based on any form of testing or research.

If you are looking for increased performance then CSC are your only option, Supersprint/Sebring etc have long since stopped producing parts for the 33. A system from CSC shouldn't be as expensive as £1000, it would cost around £600 depending on where you buy it from, I would recommend you try here:

Alfa Romeo 33 Tuning - Sportauspuff - Alfa Romeo Shop - Tuning, Styling, Fanartikel und Modellautos

or you could contact EB Spares http://www.ebspares.co.uk. They don't supply 33 parts but they are CSC distributors and if you give them the CSC part number they will be able to order anything you are looking for and their prices are not too bad.

Part numbers can be found on the CSC website: CSC Marmitte - Terminali and you can order directly from the factory if you contact them.

I presume your car has a catalytic converter? If you fit the CSC cat manifold then you will need to find a replacement catalytic converter because the manifold is designed to fit with the early European 16v cat which we did not get in the UK. It differs from the UK cat in that it is much shorter and has a 3 bolt triangular flange rather than the later UK spec cat which has a longer pipe and a 2 bolt oval flange. I have the CSC cat manifold and assumed that there was an error with the design and it was only after a lot of searching on Dutch and German forums that I found out about the earlier type cat. I then had to try to find one and eventually imported one from Denmark but it was only around £150. If you want to de-cat your car then you could just get the CSC non-cat manifold and CSC centre section but you'd need to re-fit your original manifold and cat for the MOT, something I couldn't be bothered to do.

For your interest here is the CSC manifold, I bought mine before they switched production to stainless steel so mine is mild steel. Also a picture of the shorter European early cat you would need.
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If you search for the classic alfa forum and then pm a guy called Shrew / Petrolhead he can get stainless sytems made bespoke for your car.
He has done a lot of research and his products are being used on some very successful cars

rsfruitbat
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thanks guys, will defo look into it and may go down the decat route. I think Petrolhead is a friend of the guy I bought the car from so I may get in touch with him as he knows the car.
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Originally Posted by scotchydoodle View Post
thanks guys, will defo look into it and may go down the decat route. I think Petrolhead is a friend of the guy I bought the car from so I may get in touch with him as he knows the car.
I wouldn't bother with the de-cat if I were you, the gain in power will be minimal and you will have the massive hassle factor of swapping everything back for the MOT. I de-catted my car many years ago and got fed up with all the messing about, I noticed zero difference when I put the cat back on. The cat crossover manifold is quite efficient so it makes up for some of the power that the cat will take. On paper the power figures are around 5bhp less for a cat equipped car but on the road its barely perceptible.

Why not just fit a CSC backbox, they sound lovely and might give you another couple of horsepower. If you want big power gains you'll need to do a lot more than swap the exhaust. I speak from bitter experience and my view now is "if you want a fast car, start off with one in the first place..."
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cheers guys, was thinking of de-catting purely for simplicity really, not looking for loads of power, more longevity of the system as it's got an old Bosal system on it at the mo. I think this is the first time I've looked at replacing the exhaust on a car with a cat so a bit unsure. My MOTer is a friend and quite reasonable with these matters (overlooked the missing dpf on my 2.4 159 for 3 years) but unsure how much de-catting will affect emissions.
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Alfa 33 1.7 16v

manual states the following figures

before cat
co 0.6 - 1.0
hc <= 300 ppm

after cat
co <=0.5
hc <= 50 ppm

You need 0.5 idle and 0.3 fast idle for co.

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Quote:
Originally Posted by scotchydoodle View Post
cheers guys, was thinking of de-catting purely for simplicity really, not looking for loads of power, more longevity of the system as it's got an old Bosal system on it at the mo. I think this is the first time I've looked at replacing the exhaust on a car with a cat so a bit unsure. My MOTer is a friend and quite reasonable with these matters (overlooked the missing dpf on my 2.4 159 for 3 years) but unsure how much de-catting will affect emissions.
Overlooking the DPF is a different kettle of fish MOT wise. As far as I know the tester is just required to visually confirm that a DPF is fitted where the regulations require one and no physical test is carried out. For cars registered after a certain date in 1992 they must pass the cat emissions test and as its all computer controlled these days, getting round it is probably quite tricky. It is unlikely your car will pass the required emissions requirements if the cat is removed so unless you're prepared to swap your exhaust each year for the MOT and then swap back again afterwards its probably not worth the hassle for 5 bhp or so.
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Think we'll be sticking with the cat then. AHM Motorsport have some lovely stuff, I emailed them a few weeks ago asking for a price and if the did systems to go with manifold but had no response as yet. Will maybe give them a call but I suspect that if they do, it'll be a straight through race system.
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Originally Posted by scotchydoodle View Post
Think we'll be sticking with the cat then. AHM Motorsport have some lovely stuff, I emailed them a few weeks ago asking for a price and if the did systems to go with manifold but had no response as yet. Will maybe give them a call but I suspect that if they do, it'll be a straight through race system.
No not a straight through system , They are fabricated by a company AHM uses and you can have 2 silencers as standard or go for a single back box ( what I have). Im pretty sure they will pack the silencers with as little or alot of material depending on what kind of DB's you may want. Oh don't wait up for a reply, they are a busy bunch of guys. Best call to pin them down.
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Will AHM do the installing (manifold) for you or are they just selling the bits?
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Will AHM do the installing (manifold) for you or are they just selling the bits?
They will fit it Im sure, failing that I could do it for you!.
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Hey guys, I recently bought a 1990 33 1.7 16v cloverleaf, it has had the exhaust system put on by the previous owner ( think it is stainless steel) I am also new to 33s and am wondering what people think I suggestions to get the already beautiful engine sounding even better and more bhp out of her?
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Quote:
Originally Posted by dickyb View Post
If you are looking for increased performance then CSC are your only option, Supersprint/Sebring etc have long since stopped producing parts for the 33. A system from CSC shouldn't be as expensive as £1000, it would cost around £600 depending on where you buy it from, I would recommend you try here:

Alfa Romeo 33 Tuning - Sportauspuff - Alfa Romeo Shop - Tuning, Styling, Fanartikel und Modellautos
Hi dickyb, do You know is the diameter of CSC manifold pipes exactly the same as the stock one? Or is possible for You to measure?
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Jacek, do You know when I can buy stainless in Poland ?
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I know manufacturers only - they could produce the stainless manifold similar as Yours(or if You have Your own project) if You leave them Your car for few days(week?). If You are ready for such inconvenience I can send You contacts.

You could always buy at alfisti.net, they offer delivery to Poland at 18€, as I see.
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OK. Please provide me with these contacts.
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CSC and SUPERSPRINT

Quote:
Originally Posted by scotchydoodle View Post
Hi all, sorry if this has already been discussed but i'm new to the 33 and am looking for a supplier for a stainless or performance exhaust system for my 33 16v. The only performance exhausts I've seen so far are the CSC system which is near £1000 for full manifold/system. Do you guys know of any alternatives? Also can any good 33 specialists online for parts etc?

Hi,

I have both CSC and supersprint back boxes and centre sections, they are both stainless, used,
but in good condition, if you are interested please text your details to 07957352910. and i will forward
photographs.

Liam
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