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Discussion summary
YOUR RESEARCHIPD Plenums and Larger T-Body
Leading reported evidence
Replace clutch at 107k miles and suggested
Suggestion or failed attempt
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Suggestion
I'm saying that my mechanic looked closely at the IMS while changing the clutch at 107K miles and suggested that instead of the IMS upgrade, install the IPD Plenum for better performance.
Leading evidence: 'Replace clutch at 107k miles and suggested' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace clutch at 107k miles and suggested' (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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Suggestion
It will remain untouched until my next clutch change which I'll then re-evaluate at that time.
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Suggestion
The reason is that it makes some of the cylinders to run leaner.
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Suggestion
I bought my 03C4S pre owned and it already had the IPD and software upgrade, and I don't know how many HP it has, but I do notice that it is noticeably quicker than other 996s that I test drove before.
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Replace clutch at 107k miles and suggested
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
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Discussions
Read evidence and context
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Suggestion
I'm saying that my mechanic looked closely at the IMS while changing the clutch at 107K miles and suggested that instead of the IMS upgrade, install the IPD Plenum for better performance.
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 bought my 03C4S pre owned and it already had the IPD and software upgrade, and I don't know how many HP it has, but I do notice that it is noticeably quicker than other 996s that I test drove before.
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27 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T003124Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Anyone do this?
I talked to a fellow that stated that his butt dyno was presently surprised and thought for the money it was a fantastic upgrade.
Not sure
There is an older thread here somewhere that discusses IPD. I remember that that thread also includes a dyno test done by an independent company and they could find any hp gains... Some of the people from IPD are also taking part in the discussion in that thread. I believe the conlusion is that yes, the IPD plenum might increase the hp sligthly (under certain conditions), BUT it is not due to the better airflow into the cylinders. The reason is that it makes some of the cylinders to run leaner.
I have tried to find the thread but couldn't find it, sorry.
Robert
I have this setup but haven't dyno'd it. The IPD itself made for a smoother acceleration but def not the 20-30hp claim. I wanna say 5-7hp by my butt dyno. I wasn't really expecting much from the ported throttle body except enhanced throttle response which I got. As for hp, it probably stayed the same with the IPD combo, maybe 1-2hp. It was too costly for me to dyno each mod separately so my plan is to do a whole enchilada package dyno hopefully in the fall sometime when I round out couple more mods. Btw, this is on a 3.4.
I have only put the plenum on and that was two years ago.
There was a lot of controversy at the time (maybe still is) but I for one was very pleasantly
surprised at the noticeable difference as far as seat of the pants feel go's.
I feel a clear improvement in mid range "pickup" and I have been tempted to add the larger
throttle body which may happen sooner rather than later!
Pete
I also run the IPD. I don't think there are much HP improvements but the tcar is smoother throughout the rev range and definitely more pleasent to drive with this mod.
It should be noted that the advertised claimed HP gains are not peak HP but HP gains throughout the rev range.
You know, it probably isn't worth the money to you; however, I added the IPD Plenum on my car in lieu of the IMS upgrade. I immediately noticed the difference with the Plenum right away and am satisfied with the results
I'm saying that my mechanic looked closely at the IMS while changing the clutch at 107K miles and suggested that instead of the IMS upgrade, install the IPD Plenum for better performance. He is a former senior mechanic at a local Porsche dealership and has done a fantastic job of maintaining all my Porsche cars over the past 12 years. I respect his opinion and my car runs smoother and no IMS issues. My car is at 135K miles
I know this wasn't directed to me but I've spent way more on a whole host of other mods as my IMS stays untouched. It will remain untouched until my next clutch change which I'll then re-evaluate at that time. I sleep just fine thank you.
+1 to 996p.
There has to be a way to ban people mentioning IMS in every thread. It is f***ing ridiculous.
I am willing to start a fund to hire Kimbo Slice so he could go and knock out every person who mentions IMS in unlreated threads.
I think we will have better luck bribing one of the moderators to ban the next person that says (>>>) you know what. I don't even want to use those 3 letters.
I have the plenum, but not the larger throttle body. I noticed a smoother acceleration, and feel a little more HP and TQ, but not the 25 they advertise for the 3.4L I have a "before" dyno, but not the after one yet. Clutch is starting to slip, so...
With ipd plenum and aftermarket headers/200cell/fabspeed supercups
my MAF datalog was 240 g/s max
I added larger ported TB with everything the same and MAF max was 235 g/s
I switched headers to x51 headers after the larger ported TB and now my max is 260 g/s.
My guess is the aftermarket headers were chocking the system? stock header diameter 42mm
My aftermarket one was 44.5mm. The x51's are 48mm pipes.
TB was opened up about 2mm I think..
I'm going off memory on the g/s numbers as it was earlier this year but it was similar to what I posted above.
I'm assuming higher g/s means more hp but I'll let someone else chime in on that...
I bought my 03C4S pre owned and it already had the IPD and software upgrade, and I don't know how many HP it has, but I do notice that it is noticeably quicker than other 996s that I test drove before. My best guestimate is that combined they added 20-30hp, maybe.
Patrick
