11 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH997 C2 Mods and the results
Leading reported evidence
Replace sound (which is minimal)
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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 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
Be careful about removing / blanking off the resonator, called the Helmholtz Resonator as it not only changes the sound (which is minimal) but also affects the volumetric efficiency of cylinder filling.
Leading evidence: 'Replace sound (which is minimal)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace sound (which is minimal)' (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 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
I Did some testing ( just for my own peace of mind)years ago on the K&N and found that when oiled properly it was more restrictive than the Std paper element on my Ducati 851 and the oil gummed up the altitude sensor in the airbox, and when run with no oil it made zero difference to performance, I personally think the have their place in super dusty conditions , but not for performance gains, just a personal opinion and results may vary depending on Bla bla bla bla bla
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
I Did some testing ( just for my own peace of mind)years ago on the K&N and found that when oiled properly it was more restrictive than the Std paper element on my Ducati 851 and the oil gummed up the altitude sensor in the airbox, and when run with no oil it made zero difference to performance, I personally think the have their place in super dusty conditions , but not for performance gains, just a personal opinion and results may vary depending on Bla bla bla bla bla
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 · Original poster
You can clearly see that the factory did a good job on the production airbox ,one of the best back to back dyno test video,s I have seen they went to great lengths to keep the conditions the same for all test runs and the results speak for themselves ,,even the K&N low restriction air filter has very minimum gain 2 HP ...Local Sydney guys too good honest approach ...
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.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace sound (which is minimal)
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
Be careful about removing / blanking off the resonator, called the Helmholtz Resonator as it not only changes the sound (which is minimal) but also affects the volumetric efficiency of cylinder filling.
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
I Did some testing ( just for my own peace of mind)years ago on the K&N and found that when oiled properly it was more restrictive than the Std paper element on my Ducati 851 and the oil gummed up the altitude sensor in the airbox, and when run with no oil it made zero difference to performance, I personally think the have their place in super dusty conditions , but not for performance gains, just a personal opinion and results may vary depending on Bla bla bla bla bla
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
I Did some testing ( just for my own peace of mind)years ago on the K&N and found that when oiled properly it was more restrictive than the Std paper element on my Ducati 851 and the oil gummed up the altitude sensor in the airbox, and when run with no oil it made zero difference to performance, I personally think the have their place in super dusty conditions , but not for performance gains, just a personal opinion and results may vary depending on Bla bla bla bla bla
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 · Original poster
You can clearly see that the factory did a good job on the production airbox ,one of the best back to back dyno test video,s I have seen they went to great lengths to keep the conditions the same for all test runs and the results speak for themselves ,,even the K&N low restriction air filter has very minimum gain 2 HP ...Local Sydney guys too good honest approach ...
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 · Original poster
You can clearly see that the factory did a good job on the production airbox ,one of the best back to back dyno test video,s I have seen they went to great lengths to keep the conditions the same for all test runs and the results speak for themselves ,,even the K&N low restriction air filter has very minimum gain 2 HP ...Local Sydney guys too good honest approach ...
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.
Porsche Forum Australia: 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: 20261027T175704Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Sydney based tuner did back to back dyno runs to prove the gains and losses that come with after market bolt on mods for these cars ..
Well worth a watch for anyone with 997 and considering these changes ..
A good unbiased no BS test
Yep they are crap but some claim they are the best thing
You can clearly see that the factory did a good job on the production airbox ,one of the best back to back dyno test video,s I have seen they went to great lengths to keep the conditions the same for all test runs and the results speak for themselves ,,even the K&N low restriction air filter has very minimum gain 2 HP ...Local Sydney guys too good honest approach ...
I Did some testing ( just for my own peace of mind)years ago on the K&N and found that when oiled properly it was more restrictive than the Std paper element on my Ducati 851 and the oil gummed up the altitude sensor in the airbox, and when run with no oil it made zero difference to performance, I personally think the have their place in super dusty conditions , but not for performance gains, just a personal opinion and results may vary depending on Bla bla bla bla bla
IMO the intake is a waste of time - the original is the best - also those non paper filters aren't worth it - hard to clean and has to be oiled and the oil can destroy the MAF
I have an IPD plenum though I believe in those but they aren't cheap thats the only downside
I wouldn't do the resonator mod - there is quite a bit of science behind the airflow/intake and the resonator muffler actually smooths the air pulses so the MAF can accurately read the airflow.
EDIT
:
Ahhh - Dan has beaten me to it.....
Be careful about removing / blanking off the resonator, called the Helmholtz Resonator as it not only changes the sound (which is minimal) but also affects the volumetric efficiency of cylinder filling.
Love a bang for buck butt dyno mod, but PEAK hp increase isn't the all encompassing take it or leave it metric on whether its worth doing is it?
Non stock air filters don't pair up as good with MAF sensors in general, but my butt dyno reading ticks a big induction peak noise increase leaving my driveway over a paper on my butt dyno peak induction noise meter
Surely if your looking at hp, it's a tune and exhaust first on most sports cars instead of tinkering at the edges on secondary mods ( plenums and volumetric air intake mods may work better with a tune). Plus tuning for some ain't just about peak hp dyno numbers but about butt dyno throttle response across each gear / rev range along with torque improvements ( not necessarily just peak numbers, eg area under a dyno curve)
Reckon the best bang for buck hp mod in that video runs at $125 per chp. ( air filter)
I ran at circa $95 per chp on my first round of p car bang for buck mods. Not a big difference on that metric.
But $ 125 p/chp for a peak increase of circa 2.5hp on that 997 in that video vs $ 95 p/chp for a peak increase of 60 chp on my car is a massive difference if peak hp numbers is where it is all at. Eg good luck spending another circa 5k on that 997 to get another 50chp.
The butt dyno is as accurate as the name implies, quite often a drop off in midrange followed by a steeper rise to where you started, and sometimes lower, Multiplied by the dollars you spent gives your butt the answer it was looking for
This is a source reference. Confirm exact model applicability in the original material.
