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(Post Link) post #1 of 1874 Old 26-11-09 Thread Starter
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Wizard Exhausts for V6 Alfas

2017 update

We can now offer Wizard cat-back exhaust systems in a variety of fitments, as well as optional decat pipes, sports cats and front pipes, equal length & unequal length depending on preference:

156 2.5 V6
156 GTA
147 GTA
GT 3.2 V6
GTV 3.0 / 3.2 V6 in either twin exit or quad exit
Brera/Spider V6
155 V6

We also offer tubular stainless steel decat exhaust manifolds for all 156/147/GT/GTV 24v engines!

We have also developed a cat-back exhaust system for 4 cylinder models, giving a similar raspy and typically Italian sound

Mito 1.4 turbo (120hp, 135hp, 155hp, 170hp QV)
Giulietta QV 1750
Giulietta 1.4 turbo MA
GT 2.0 JTS / 1.8 TS & diesels
156 Twinspark, JTS & diesel models
GTV 2.0 TS

For Brera and 159 models - all engine sizes - we also offer straight through backbox replacements either with twin slash cut exits for the Brera or rolled stainless steel round exits on the 159s.

Search for Wizard Exhaust with your model on Youtube for lots of videos, and feel free to checkout our facebook page for lots of photos:

https://www.facebook.com/WizardExhausts

In development: Decat exhaust manifolds for Brera/159 3.2 V6 models

Autolusso Penrith - UK's leading independent Alfa Romeo specialist with branches in Bedfordshire, Cumbria & Dorset

Wizard Exhaust systems available here

Tel: 01768 879 171

Last edited by Pud237; 17-01-17 at 16:27. Reason: Change title
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(Post Link) post #3 of 1874 Old 26-11-09 Thread Starter
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I'm glad you were the first to reply mate. You can be our 156 GTA test pilot then
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OK
My wallet is nervous already
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Any idea of rough cost Dan? Would he do one for a GTV?
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Any idea of rough cost Dan? Would he do one for a GTV?
Not yet on cost, we don't know if the backbox is 2 hours work or 20 hours work.. GTV V6 is something I did think about - there is no reason why its not possible, but the exhaust system is totally different to 156/147/GT, the space constraints are different as well. But it is do-able, and I'd like to do it.
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Originally Posted by Pud237 View Post
Not yet on cost, we don't know if the backbox is 2 hours work or 20 hours work.. GTV V6 is something I did think about - there is no reason why its not possible, but the exhaust system is totally different to 156/147/GT, the space constraints are different as well. But it is do-able, and I'd like to do it.
Understood
I shall be keeping my eye on this thread
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Is there any way to hear how the original Unicorse sounded on your car Pud?
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(Post Link) post #9 of 1874 Old 27-11-09 Thread Starter
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Here is my exact backbox and equal length front pipes with standard cat and centre section on the last car it was fitted to, 156 2.5 V6:

YouTube - Unicorse exhaust

Just the backbox on a GTA:

YouTube - Alfa 156 GTA with Unicorse Type II Muffler

My car in the tunnels of London:

YouTube - Alfa run - 06/07 November 2009!
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Waiting for the price list now
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I am really interested, I will keep following this thread, but few comments:

- Price should be lower to Supersprint quad what is my other option, preferably lower to supersprint OO exhaust Money conditions allow me to purchase only in second half of January 2010 as earliest.

- in case you do straight 147GTA fit, its the best one for me, but if not possible, just the box is acceptable and I can have the tailpipes and pipe connecting to centre part custom made locally.

Are you planing a centre section that could be bolted on OEM cats? I dont want de-cat. And I would be interested in it if it had a silencer. Otherwise I will use supersprint silenced center section. Basically I want the unicorse sound, but I dont want it to be too loud as my target for future is 200 cpi main cat, custom manifold without precats and equal lenght front pipes.

147GTA,Grigio Metallico,Imola leather,3.75l conversion,ported heads,F575 TB,Carbon plenum,Stainless manifolds,EQ pipes,Supersprint silenced cat back,18" GT multispokes,KW V3,Galfer 6pot 355mm,Brembo sport rear

147 1.6TS, Nerro,Beige Interior,Galfer Extreme Brake kit,2,0TS intake manifold,Custom ex. manifold,200CPI cat,Supersprint silenced center + OO backbox,GTA spoiler,GTA side skirts,GTA headlights,Blaupunkt LA MP74 + Focal + MacAudio + Dynamat + HERZ subwoofer
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I'm happy with my supersprint cat back but would be interested in equal length front pipes and twin sports cat setup if that's part of the offering.
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Quote:
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I'm happy with my supersprint cat back but would be interested in equal length front pipes and twin sports cat setup if that's part of the offering.
Well, for this option, you could count me in as well :-)
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Quote:
Originally Posted by gotcha View Post
- Price should be lower to Supersprint quad what is my other option, preferably lower to supersprint OO exhaust Money conditions allow me to purchase only in second half of January 2010 as earliest.
The 147 GTA stuff won't be ready until at least January 2010 anyway, as everything is getting done outside of working hours, weekends and evenings, plus there is about 50 miles between me and the Wizard, which doesn't help..

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- in case you do straight 147GTA fit, its the best one for me, but if not possible, just the box is acceptable and I can have the tailpipes and pipe connecting to centre part custom made locally.
As you are so far away, it might be easier just to send a backbox, which would making shipping a lot easier and cheaper..

Quote:
Originally Posted by gotcha View Post
Are you planing a centre section that could be bolted on OEM cats? I dont want de-cat. And I would be interested in it if it had a silencer. Otherwise I will use supersprint silenced center section. Basically I want the unicorse sound, but I dont want it to be too loud as my target for future is 200 cpi main cat, custom manifold without precats and equal lenght front pipes.
Sorry - I forgot to mention. The decat section incorporates a large silencer, because this is where there is most room for it to fit, instead of having it on the centre pipe. The silencer is designed internally to increase the pitch of the noise, you can probably tell the difference between my tunnel run video and the one of the GTA with just the backbox. But even with only 1 centre silencer and no cats (as it is on my car) its not really what you would call a loud system. Volume-wise it is on a par with Swanny's 156 GTA with Supersprint cat-back system.

Quote:
Originally Posted by GhostyDog View Post
I'm happy with my supersprint cat back but would be interested in equal length front pipes and twin sports cat setup if that's part of the offering.
Equal length front pipes are difficult to do, the GTA exhaust manifolds end in a different place to CF2 156 V6 ones, and also the oil cooler take off is in the way on a 147 GTA, also the front pipes are two seperate pieces, on a CF2 2.5 V6 it is a Y-section. The only feasible way of making equal length front pipes is doing it on a car. We can make 156 2.5 V6 CF2 front pipes, as we have mine jigged so know exactly where the flanges need to be, where the bends need to be etc.

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You're going to have to solder two resistors inline with your rear lambda sensors to keep the engine management light off, as you have no manifold cats. But other than that, it will be fine. Your's will probably sound the best of all, without those manifold cats but with the bigger bore of the GTA system..
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You're going to have to solder two resistors inline with your rear lambda sensors to keep the engine management light off, as you have no manifold cats. But other than that, it will be fine. Your's will probably sound the best of all, without those manifold cats but with the bigger bore of the GTA system..
yup yup yup. is this just the back box we're on about here or b/b and centre pipe?
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yup yup yup. is this just the back box we're on about here or b/b and centre pipe?
Backbox, centre pipe & decat section for the two main cats.. Although if you just wanted a backbox we could do that.
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Backbox, centre pipe & decat section for the two main cats.. Although if you just wanted a backbox we could do that.
the full lot will do like
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the full lot will do like
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Quote:
Originally Posted by Pud237 View Post
Sorry - I forgot to mention. The decat section incorporates a large silencer, because this is where there is most room for it to fit, instead of having it on the centre pipe. The silencer is designed internally to increase the pitch of the noise, you can probably tell the difference between my tunnel run video and the one of the GTA with just the backbox. But even with only 1 centre silencer and no cats (as it is on my car) its not really what you would call a loud system. Volume-wise it is on a par with Swanny's 156 GTA with Supersprint cat-back system.
Ahhhh, this is pretty original, I never thought about replacing dual cats with big silencer..... I will give it a thought, but I at the moment you can put me down as "just backbox interested" person
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Quote:
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Backbox, centre pipe & decat section for the two main cats.. Although if you just wanted a backbox we could do that.
Doesn't that mean you'd have no cats at all?? Emissions would be off the scale, and I'd imagine the noise would be....insane

If I hadn't got the Supersprint, I'd have my name down too.
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I've not got any cats fitted at the moment (my CF2 V6 has just one large cat as standard), so just one silencer in place of the main cat, and the backbox, centre pipe is straight through. It is quiet on idle, quiet-ish on a light load, nice and loud at full throttle but not deafening, and there is no drone at any rpm when on the motorway which I am thankful for. Volume at the moment is about the same as Swanny's Supersprint cat-back exhaust (I think his is unsilenced) - plus I got through the noise test at Bedford no problem, and even going past the noise boxes around the track on full throttle it wasn't an issue.

As for no cats - just bolt one back in for MOT time - thats what I do
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Slight tangent - but I'm continually confused about removing cats. I want to remove my main cats, yet while you haven't had any issues Pud (and neither did Mark with his Scorpion test setup), I've also been told the car won't run correctly with the cats removed?
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OK, I have attached a badly knocked-up diagram in MSPaint showing all the parts of a standard GTA exhaust system except for the backbox which I didn't have room for.

So you can see 2 x manifolds each with a built in cat (blue) and a lambda sensor (red). Then there are 2 x front pipes (which are seperate to each other). Then there is the main cats, which start off seperate, and then join after the lambdas. Then the centre pipe which is just a pipe with a silencer in it, then the backbox.

The first pair lambda sensors are there to control the fuelling, the second pair are to measure emissions. As you can see, the exhausts from each bank of cylinders doesn't join until after the main cats & second pair of lambda sensors, so you can treat each half of the engine seperately.

The engine management cannot detect a fault if only one cat from each bank of cylinders is removed, it doesn't matter whether this is the manifold cats, or the main cats. As there is still one cat per bank between the first and second lambdas, the values of the two lambdas will be different. But if both pairs of cats are removed, then the secondary lambda sensors will be reading the same value as the primary lambda sensors, so it will trigger an error. To get around this, you can solder in a resistor in line with the secondary lambda sensors to adjust the voltage it is reporting to the ECU, so it thinks the cats are still there.

On my car, which is a CF2, the exhaust systems from each cylinder join up almost straight away, because the front pipes are a Y-section. Then there is one lambda sensor which controls fuelling, then a single cat, and thats it. The ECU cannot detect the presence of a cat or not, the only way the lack of a cat can affect the running of the car is lower backpressure and lower cylinder temperatures. With lower cylinder temperatures, you can advance the ignition and run a leaner air-fuel ratio with less risk of melting a piston or knocking. Also, the engine makes more power as instead of the exhaust gasses needing to be pushed out of the cylinders by the piston on its upward stroke (wasting power), the exhaust gasses flow freely from the engine, sucked out by a properly tuned exhaust system..

HTH

Last edited by Pud237; 13-04-16 at 01:15.
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Sorry - I forgot to mention. The decat section incorporates a large silencer, because this is where there is most room for it to fit, instead of having it on the centre pipe. The silencer is designed internally to increase the pitch of the noise, you can probably tell the difference between my tunnel run video and the one of the GTA with just the backbox. But even with only 1 centre silencer and no cats (as it is on my car) its not really what you would call a loud system. Volume-wise it is on a par with Swanny's 156 GTA with Supersprint cat-back system.


Interested in this decat section if you're going to 147 GTA versions..?
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