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performance upgrade question for 03to04 C4s

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHperformance upgrade question for 03to04 C4s

Reported or suspected cause

really expensive, like $40k

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No successful repair reported for this finding.

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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 report identifying a cause
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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.

Reported cause

They had t packages for these cars, but never really produced them, as they turned out to be really expensive, like $40K.

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performance upgrade question for 03to04 C4s
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Leading evidence: 'really expensive, like $40k' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'really expensive, like $40k' (1 discussions; 1 report identifying it and 0 suggest it). No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 3 captured posts examined · 0 partial discussions

Reported and suspected causes (1)

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really expensive, like $40k

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.

Reported cause

They had t packages for these cars, but never really produced them, as they turned out to be really expensive, like $40K.

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performance upgrade question for 03to04 C4s
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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.

3 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: 20261027T192637Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Could I be able to add twin turbo on C4s?

POST 2Original post

They had t packages for these cars, but never really produced them, as they turned out to be really expensive, like $40K. The best (and pretty much only) forced induction for your car is the supercharger. Check out www.evoms.com. You can get 400 whp/470 hp for about $12 K installed.

POST 3Original post

You'd be better off selling it an buying the TT.

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