15 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHExtra fittings when changing exhaust boxes
Leading reported evidence
Replace bolts (long and short)
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I did exactly the same - replaced the bolts (long and short) with stainless ones off ebay:
Leading evidence: 'Replace bolts (long and short)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'clamps as well' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace back boxes' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I also replaced the tubes, as they had fallen to pieces.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Performed · outcome unconfirmed
I used new stainless bolts from ebay and made new ali tubes from the raw metal stock available in B&Q's Porsche parts department.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
At least the long bolts holding them to the bracket will definitely need replacing, but likely the clamps as well.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I'm going to be getting the switchable cat-back exhaust from TopGear soon. My plan is to have it fitted at local Indy or by a mobile mechanic.
As well as the exhaust, what other fittings would it be prudent to replace or that I might need ahead of time?
I'm thinking things along the lines of clamps/sleeves or new stainless steel bolts for example. I figure I might as well get any cheap things replaced that end up being loosened or removed to change out the exhaust.
Link to exhaust kit is here:
https://www.topgear.co.uk/porsche-911-996-carrera-valved-cat-back
Currently I have the original boxes and cats on. Keeping the cats for now. I get a drip on the joint between cat and boxes, so wondered if I should buy new sleeves/joints?
The back box brackets will likely be rusty. As they are insanely expensive I had them rubbe down and painted. You can also buy a fixing kit for other bits and pieces from design 911.
The manifold bolts can be problematic - in a recent thread 8 of 12 snapped off in the heads. If you're fitting new manifolds, I'd be inclined to take it to a Porsche indy as drilling and tapping is best done on a ramp and they will have encountered this before.
Some replace with titanium others stainless. I'm erring towards stainless studs and nuts rather than bolts.
Do you have a link to the exact kit I should buy? As I've not done this before I don't know what comes with the exhaust kit versus what you're expected to re-use from the existing stuff on the car.
Many thanks!
I used the Dansk kit from Design911 as well. It comes with everything except the spacers and metal meshy dampeners that attach the silencers to the brackets. The exhaust tip clamps alone cost more than the whole kit!
https://www.design911.co.uk/fu/prod13006/Mounting-Kit-for-Rear-Exhaust-Porsche-996-Carrera---GT3/
My suggestion is to not even attempt replacing the silencer without the kit. At least the long bolts holding them to the bracket will definitely need replacing, but likely the clamps as well.
My long bolts that go bolt the silencer to the brackets were very badly rusted to the tubes that they run through. I used new stainless bolts from ebay and made new ali tubes from the raw metal stock available in B&Q's Porsche parts department. They will never rust or seize again. Also the solution was a fraction of the cost of buying the same bolts/tubes from D911 or an OPC.
I did exactly the same - replaced the bolts (long and short) with stainless ones off ebay:
https://www.ebay.co.uk/itm/201002656150
I also replaced the tubes, as they had fallen to pieces.
Are the tubes shown on this diagram?
https://www.dropbox.com/s/z9f6pvbuignf2aa/Screenshot 2019-06-10 10.18.01.png?raw=1
I'm just trying to get a part so I can either get them ahead of time or get dimensions to make some new ones. Thanks!
Looks to be part 35 on the diagram. I made mine from aluminium tube with an inside diameter of approx 8mm, the wall thickness was approx 1mm. Just a case of cutting it to length and pushing it through the steel-wool damping washers (at the top and bottom). I happened to have some already in the garage, but am sure B&Q or homebase will have something suitable. Saves paying the porsche tax......
Thanks. That makes sense. Weirdly number 35 doesn't have an associated part number. That's the first time I've found a part diagram that doesn't have an associated part number in the 996 parts PDF :dont know:
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