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Discussion Starter · #1 ·
Went out today perfectly normal, drove 6 miles, left car 1 hour, returned and started it - rear silencer box fractured where pipe enters box.
Not too noisy, but also this lack of rear box seriously affected boost. Car now will not even get to top of yellow.
The box is seriously corroded and had been making a little noise for some time,but you know how things are.
On related topic, the two exhaust manifold studs to the head on the left hand side of the manifold are sheared. They have been like this for at least 15k miles. Should i leave well alone? No signs of blowing (no black or hard tapping). Is this a head-off job?
Where can I source a rear box? Anybody have one? When I enquired a few weeks ago at a motor factor they do not specifically list the Carlsson and the box they say is 'correct' has not got the twins.
 

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Discussion Starter · #2 ·
now i have box off i can see weld has failed and the front piece if pipe has simply slipped out of the silencer. So should be straightforward to weld, particularly since clamps are free to swivel; alignment unimportant.
But what is this silencer made of? Serious corrosion but only on an outer skin - the metal underneath is perfect and strong. Almost as if there is a sacrificial layer put onto the casing. No rattling inside so this box will do while i hunt around. I might even phone Saab.
ps anyone know whether other models have identical back box?
 

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As far as I know the twin "sports" back box is now no longer an availible part from SAAB.
I had one made by an exhaust specialist some years ago at reasonable cost, but it ended up being too noisy after a few months. I then bought a recent second-hand origional part from a chap who'd purchased a Abbott system.

My car suffers from broken head bolts as well. It seems the left hand pair is a common fault.
Mine do leak some air when the engine is cold, and produce a squealing sound under boost which can be mistaken for a slipping belt!!!! I hadn't realised that the leak might be affecting performance, as I'm going to have them done soon I'll let you all know if it improves matters;-)
 

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the bolts were sheared on my carlsson, the garage took the head off to sort them out, but I was later told it can be done leaving the head on I THINK it was Trent Saab that told me...give them a call, they are very helpful
 
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