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Rusted exhaust system
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Onno le Roy



Joined: 22 Apr 2010
Posts: 19
Location: DUBAI
PostPosted: Thu Apr 22, 2010 13:25    Post subject: Rusted exhaust system Reply with quote
My catalytic converter has a big hole in it so need to have a new system made starting from exhaust manifold to muffler. Are there any recommendations I should follow - anyone who has any input?[/list]
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Last edited by Onno le Roy on Fri Apr 23, 2010 11:11; edited 1 time in total
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zag



Joined: 21 Apr 2010
Posts: 53
PostPosted: Thu Apr 22, 2010 17:37    Post subject: Reply with quote
Forget the cat... just get new downpipes without cats (but with a flexible connection).. your SZ will go quicker, sound much better and still pass emissions..

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wrinx



Joined: 24 Dec 2009
Posts: 243
Location: United Kingdom
PostPosted: Thu Apr 22, 2010 18:35    Post subject: Reply with quote
Not looked at the exhaust to check if this is a daft question...but how about just replacing the cat with straight through pipe(s)?

wrinx
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zag



Joined: 21 Apr 2010
Posts: 53
PostPosted: Thu Apr 22, 2010 22:38    Post subject: Reply with quote
The problem with doing that is that it does not allow any 'play' in the system and it would probably crack the headers...

I have the original exhaust system but with SS downpipes with flexible connectors and all works perfectly.

Best modification I have done!

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Onno le Roy



Joined: 22 Apr 2010
Posts: 19
Location: DUBAI
PostPosted: Fri Apr 23, 2010 6:04    Post subject: Exhaust system Reply with quote
OK - understood you do not need the cat and you do need a flexible joint somewhere. But a) is it required to make a change to the downpipes (exhaust manifold) or can I re-use these? Also, what is the recommendation for the silencers under the car - should I retain these (well, new ones of course) or can they be ommitted? Should I have a combined silencer or 2 separate?
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lancia fulvia zagato 1600 - 72
lancia beta montecarlo spider LHD - 77
lancia beta montecarlo spider RHD - 78
lancia delta integrale evoluzione giallo ginestra - 94
alfa romeo sprint zagato - 91
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wrinx



Joined: 24 Dec 2009
Posts: 243
Location: United Kingdom
PostPosted: Fri Apr 23, 2010 16:38    Post subject: Reply with quote
zag wrote:
The problem with doing that is that it does not allow any 'play' in the system and it would probably crack the headers...


The flexi-joint isn't part of the cat is it (again, without looking at the exhaust!)?

Edit:

Here ya go...can't see any flexis in the original, apart from the circular gasket to the headers so does it need them?


Manifold - downpipe - decat (Y shape) - twin pipe box
or...
Manifold - downpipe - 2x decat - twin pipe box


I'd be loathe to remove any boxes or it'll get noisy imho...did this on my old 155 V6 and it gave me a headache until a larger rear box was fitted.

wrinx
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zag



Joined: 21 Apr 2010
Posts: 53
PostPosted: Fri Apr 23, 2010 19:59    Post subject: Reply with quote
No, there are no flexible joints in the original. I was told that the flexible joints are there to help reduce the stresses placed on the exhaust system.

The rest of my exhaust is original and plenty loud enough once you have removed the cats, so I would just replicate the rest of the original system.

zag
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wrinx



Joined: 24 Dec 2009
Posts: 243
Location: United Kingdom
PostPosted: Fri Apr 23, 2010 23:19    Post subject: Reply with quote
zag wrote:
No, there are no flexible joints in the original. I was told that the flexible joints are there to help reduce the stresses placed on the exhaust system.


You're right, they take out the "bounce" in the exhaust, more important on FWD cars I think, where the engine rocks back and forth when revving, but I'd be surprised if there aren't any to be honest Smile

Having said that, my old 1.8 155 just had some (carbon?) rings which acted as a hard but flexible joint...wonder if they're fitted???

wrinx
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Onno le Roy



Joined: 22 Apr 2010
Posts: 19
Location: DUBAI
PostPosted: Sat Apr 24, 2010 4:48    Post subject: Reply with quote
Okidoki - sounds like I should just replicate the original but get the kat removed...The flex joint may or may not be required, will look at that when talking to the manufacturer. Cheers guys.
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lancia fulvia zagato 1600 - 72
lancia beta montecarlo spider LHD - 77
lancia beta montecarlo spider RHD - 78
lancia delta integrale evoluzione giallo ginestra - 94
alfa romeo sprint zagato - 91
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zag



Joined: 21 Apr 2010
Posts: 53
PostPosted: Sat Apr 24, 2010 23:15    Post subject: Reply with quote
Flexible joint or not you will enjoy your car much more once the cats are removed!!

zag
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Anonymous
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PostPosted: Sun Apr 25, 2010 7:55    Post subject: QuickSilber Auspuff Reply with quote
Hallo
Der Bester Klang für den SZ ist Quick Silber aus Englang die es gib noch
CSC ist aber zu leise
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wrinx



Joined: 24 Dec 2009
Posts: 243
Location: United Kingdom
PostPosted: Sun Apr 25, 2010 11:02    Post subject: Re: QuickSilber Auspuff Reply with quote
alfasz996 wrote:
Hallo
Der Bester Klang für den SZ ist Quick Silber aus Englang die es gib noch
CSC ist aber zu leise



Google: Hello, The best sound for the SZ is the Quick Silver from Englang give it yet CSC is too quiet

Thanks for the advice Smile
Vielen Dank für die Ratschläge Smile

wrinx
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zag



Joined: 21 Apr 2010
Posts: 53
PostPosted: Sun Apr 25, 2010 23:19    Post subject: Reply with quote
I think the Quick Silver exhaust system is only from the cats back.... sounds good, but without the power increase of removing the cats...

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Anonymous
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PostPosted: Sat Jul 17, 2010 12:12    Post subject: Alfa Sz Auspuff Reply with quote
Hallo was neu ist auch von Supersprint
ist auch sehr gut
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frankalfa



Joined: 05 Jun 2010
Posts: 78
Location: holland.
PostPosted: Sat Jul 17, 2010 16:59    Post subject: Re: Alfa Sz Auspuff Reply with quote
alfasz996 wrote:
Hallo was neu ist auch von Supersprint
ist auch sehr gut


Hi alfasz996, do you mean that Supersprint has an aftermarket exhaust system for the SZ?
Is there a link or picture available?

Regards,fRank
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