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YOUR RESEARCHWhich IPD Plenum
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Use liberally
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Suggestion
All normal 996s should use the regular plenum for optimal performance.
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I have searched the forum and could not find my answer.
I also tried calling and emailing the IPD guys, no answer.
My question is, which plenum is best for a 2004 4S with PSE?
They have a Carrera S model and also a Competition model that requires the larger TB and a free flowing exhaust.
TIA
I have the regular one on my car, love it (subtle sound improvement & better airflow with this & resonator delete). Other guys have the bigger TB & competition unit, same results from what I've read. If you're lucky you'll get some feedback on how best to utilize the larger TB/Plenum (think ECU tune, exhaust upgrades). What I've read from Jake/FlatSixInnovations, the benefits of the larger TB/Plenum are minimal until you get more displacement to work with (bore out to 3.8 or 4.0L). So with a bigger displacement car you can more effectively utilize the increased airflow. I have not read that it hurts performance at all, but maybe others can share more specific detail.
Bottom line, I think it's worthwhile to add an IPD unit. GL whatever you choose.
for my 04 4S , K&N air charger CAI, IPD normal, complete SS exhaust, headers, cats, mufflers all same as maxspeed sells, or agency power,
and REVO stage 2 ecu software. All runs great.
If you get the TB upgrades you need to find a ecu that learns so it will compensate. Try asking EVOMSit or some other tuners that deal with the TB mod
I know RSS was the distributor for IPD. I think it is rss rpmware or something like that
I have the IPD competition intake
GT3 throttle body
Fabspeed carbon intake
Tubi headers
Fabspeed xpipe 200 cell cats
Tubi mufflers
All I can say is that the intake with the throttle body made a difference in throttle response
And seat of the pants feel
Didn't dyno
Posting for Jake b/c my hourly rate is lower than his :P
RE: competition or regular...
IPD material that Sneaky Pete has posted before:
and a lovely presentation* I created with stolen pictures:
they create.... VORTICES
*some terms used liberally
Let me re-phrase...
RE: competition (83mm throttle body) or regular (72mm stock throttle body)
Cliff notes: Buy the one that fits the OEM, stock throttle body. Only buy the larger, competition plenum if you're planning a full rebuild of the motor to include more displacement (3.8L and above). All normal 996s should use the regular plenum for optimal performance.
Source: The guy on the forum that knows more than anyone else about these cars (Flat6Innovations)
I have decided to not purchase a plenum from IPD.
If they can't take a moment to respond to the emails I sent them, I can only imagine they will not respond if I have a problem.
They never answer the phone either.
No way I am forking over ~$800 to be ignored.
I think it is a questionable product anyway.
Did you ever get a response from IPD?
It's a shame you've had that experience, i've found Greg's customer service to be excellent even to international customers like me. Don't give up!
