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I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

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YOUR RESEARCHI'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

Leading reported evidence

Recommend pre-purchase inspection

Suggestion or failed attempt

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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 contain suggestions: 1

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Suggestion
Without a doubt I would recommend a pre-purchase inspection that performed a leak down and compression test on all cylinders.
Original post Read captured discussion
I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

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Leading evidence: 'Recommend pre-purchase inspection' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend pre-purchase inspection' (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.

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Replace after each track day and looking

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
Keeping up on the oil changes after each track day and looking for metal debris in the gearbox and front diff oil will help you see the problem coming before it becomes an issue.
Original post Read captured discussion
I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

Test on all cylinders

Suggestion or failed attempt

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
Without a doubt I would recommend a pre-purchase inspection that performed a leak down and compression test on all cylinders.
Original post Read captured discussion
I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Recommend pre-purchase inspection

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
Without a doubt I would recommend a pre-purchase inspection that performed a leak down and compression test on all cylinders.
Original post Read captured discussion
I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

Replace after each track day and looking

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
Keeping up on the oil changes after each track day and looking for metal debris in the gearbox and front diff oil will help you see the problem coming before it becomes an issue.
Original post Read captured discussion
I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

Test on all cylinders

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
Without a doubt I would recommend a pre-purchase inspection that performed a leak down and compression test on all cylinders.
Original post Read captured discussion
I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp?

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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.

Pelican Parts: 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: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I'm wanting to purchase a 2004 Porsche 911 Turbo - 660HP EVOMS GT660. Is the 3.6L engine going to be reliable? Will the transmission and rear end hold up to all this hp? Thanks, Rod __________________ This post was auto-generated based upon a question asked on our tech article page here:

POST 2Original post

I am wondering if there are strengthening mods in the gearbox at that horsepower. I was told that the stock box could do 600..That HP is kind of right at the limit of what I would say is reliable. Keeping up on the oil changes after each track day and looking for metal debris in the gearbox and front diff oil will help you see the problem coming before it becomes an issue. The engine oil consumption is the indicator of engine health on a vehicle like that. Without a doubt I would recommend a pre-purchase inspection that performed a leak down and compression test on all cylinders. The shop I worked at upgraded a 996 to 600 HP and that car still drives around today with the stock gearbox and bottom end, but was responsibly driven and enjoyed. - Casey

POST 3Original post

I wouldn't worry about it. Unless the car has been heavily dragged raced it should be fine. That is not even beginning to be stressed on either the engine or gearbox. In the 996tt world you are still in bolt on mods power levels. Regards, Matt Monson Guard Trandmission LLC.

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