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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRemoval Of Headers!
Leading reported evidence
Replace cats
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Read evidence and context
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
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
Not sure of the Fabspeed mufflers or any muffler change for better performance as when you change the exhaust system you tamper with the power curve (e.g., you may notice a loss in low-end performance and a slight gain in high-end, 5000+ rpm).
Leading evidence: 'Replace cats' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace better performance as' (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.
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
Eventually the car was sent to a specialist engineering shop, who used a carbide drill bit to drill the studs out and then the holes were helicoiled.
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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Performed · outcome unconfirmed
The last one was very troublesome, I ended up using a dremel to grind the head off the bolt and was then able to slip the manifold off and luckily twist the remaining piece of stud out.
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 contain suggestions
1
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.
Suggestion
Not sure of the Fabspeed mufflers or any muffler change for better performance as when you change the exhaust system you tamper with the power curve (e.g., you may notice a loss in low-end performance and a slight gain in high-end, 5000+ rpm).
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 contain suggestions
1
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.
Suggestion
Not sure of the Fabspeed mufflers or any muffler change for better performance as when you change the exhaust system you tamper with the power curve (e.g., you may notice a loss in low-end performance and a slight gain in high-end, 5000+ rpm).
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace better performance as
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
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.
Suggestion
Not sure of the Fabspeed mufflers or any muffler change for better performance as when you change the exhaust system you tamper with the power curve (e.g., you may notice a loss in low-end performance and a slight gain in high-end, 5000+ rpm).
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.
Suggestion
Not sure of the Fabspeed mufflers or any muffler change for better performance as when you change the exhaust system you tamper with the power curve (e.g., you may notice a loss in low-end performance and a slight gain in high-end, 5000+ rpm).
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
The last one was very troublesome, I ended up using a dremel to grind the head off the bolt and was then able to slip the manifold off and luckily twist the remaining piece of stud out.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi guys,
How difficult is it to remove the headers? Do we need to drop the engine to do so? Was thinking of swapping out my X51 headers for some Evom's headers.
Cheers
I believe the Porsche exhaust manifolds are fine. Not sure of the Fabspeed mufflers or any muffler change for better performance as when you change the exhaust system you tamper with the power curve (e.g., you may notice a loss in low-end performance and a slight gain in high-end, 5000+ rpm). However, when I changed my Cats to 200 cell Cargraphics I did notice both low and high end performance increases. When I added the Cargraphic sport mufflers I lost low end. Sounds good though..
Being that you live in Singapore, my money's on you having a problem with the bolts. With such high humidity perhaps they have seized. The X51 headers are just fine.
When the bolts are new it's a piece of cake.
Me and my exhaust manifolds have had a long battle with each other. I decided I wanted to re gasket the exhausts and change the manifolds as they were looking quite rusty (UK weather).
The right side were moderately annoying, I had to bash a socket on to 4 and with a bit of effort they came out. The other 2 were more difficult, I had to weld a bolt onto one and managed to get it out. The last one was very troublesome, I ended up using a dremel to grind the head off the bolt and was then able to slip the manifold off and luckily twist the remaining piece of stud out.
The left side.... Oh my god.... No socket on earth could remove them (3 sheared in half). Welding didnt work at all. I grinded off the head of the remaining 3 bolts (12 hours work) and then with a lot of force slipped the manifold off over the little studs. The studs wouldnt come out at all (i tried EVERY trick in the book). Eventually the car was sent to a specialist engineering shop, who used a carbide drill bit to drill the studs out and then the holes were helicoiled. The labour cost 800 pounds (1300$$). These guys work on lots of very very old classic cars and they said this was the worst job they have ever had.
So.... I got new gaskets, new manifolds and new bolts and put the whole thing back together (all OPC parts and bolts). 2 months later everything was completely rusted again... I was so angry that porsches parts were so awful. I ordered stainless steel bolts, stripped it all apart again and replaced everything with new stuff. I also applied lots of copper grease and lots of rust proofing where i could.
So after the best part of probably 1500 pounds im no better off. The only advantage I have is that If i ever want to remove my cylinder heads I will have an easy time.
Rusted manifolds are the worst job ever... Think very very carefully before you proceed.
Removing the exhaust and replacing with headers is a piece of cake as long as the header bolts come out. When putting the bolts back in, remember to use Phillips Milk of Magnesia! Use the regular flavor, no mint. This is the best anti seize as it is used in aircraft engines!
Removal was easy... Putting the headers back was not, I broke 8 of the 12 bolts...
And for anyone doing this job, DO NOT TRY TO WELD THE BOLT'S.
Bolt's will get hardened and special drils are needed to get those of.
Just drill those if they broke, normal drils will work if no welding etc. is done.
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