I've got the K&N FIPK system on my 997.1 S with no tune or other mods. No telling if it has added the advertised power; but it sounds great and it also appears to have the throttle response of a 997 S with Sport chrono 'sport' activated. No complaints with it; however, it throws a CEL. I was planning on doing a Eurocharged Tune as they are local and I had a good experience with them when I tuned my SL500.

The question I have is will the GT3 throttle body with the competition plenum fit with the K&N setup? Or will I be better off adding the regular plenum to the K&N? Or will a better setup be a BMC Filter with the stock airbox and the GT3 throttle body/IPD Competition Plenum.

Whichever route I go, I plan on doing the ECU flash soon.

All opinions appreciated.

 

The K&N should not throw a CEL. What is the code you're getting? I would resolve whatever the current issue you have that's throwing the code before adding more variables.

 

It didn't throw a CEL at first, when we got a cold snap that's when it threw the code. I have forgotten the code but I want to say it was directly associates with the air flow...by this time...it could be K&N oil affecting the MAF...I've had the intake for about 2 years now. I'm dropping my car off this week for brakes, oil change, and hopefully the plenum...my mechanic will be able to check the maf and code. I haven't experienced any degradation in performance...at least perceptually.

 

Hey DrJordan1911,

Lots of questions...

I have the K&N setup with 74 mm IPD plenum. I also have the Gt3 Throttle body and 82mm Competition plenum in a box in my garage. I have used both setups. I am going to geek out on you, but I am sure you are here looking for answers/suggestions.

1. Throwing a cell code. You have had the K&N a couple years and this is the 1st time you are throwing a code. hmmm. Need to know what the code is for. If you had just installed the K&N and threw a code, then most likely you know it was the sudden change. The source for the code is a bit vague at the moment. Mass air flow sensors can get old and dirty, so a good cleaning with CRC Maf cleaner would be a good idea. I clean mine every 6 months. See if that helps.

2. How is your idling? Do you have a little bit of a jumpy or rough idle right before the code comes on?? If you ever have any issues with rough idle during weather or temperature changes this may be helpful.
I came up with this because I purchased the competition plenum and gt3 throttle body. I had the 74 mm IPD plenum before hand, but had an itch to scratch. After adding the IPD Competition parts I had idling issues and started to throw cel codes which had to do with lamda air readings. I did ecu resets, throttle body calibrations, and took it to the dealer, but the cel code would come back after the resets. So I figured out a $20 mod that helps smooth out the airflow and completely fixed the problem. It dawned upon me when I recently put my old airbox on for a comparison. Well I can say for certain that I am not crazy and neither are you when it comes to the K&N. . My feelings are exactly as yours. The K&N makes a really nice difference and is way better in power and sound delivery than stock. I put the old airbox in storage and will keep the K&N on for good. The car is just way more fun to drive and feels more responsive!
Ok, Back to fix...So, While I was looking at the old oem air box, specifically the old air mass sensor housing I noticed there is a couple of screens built in to the air mass sensor housing. 1 is a plastic screen/honeycomb and the 2nd one is a metal screen with finer openings. So I found a $20 mass air flow sensor/housing with the exact diameter as ours and basically removed the screens from it. I only use the plastic circular screen which keeps good air flow. The metal screen looks like its over kill. It fits perfectly and held nicely in the the opening of the K&N cone filter. The purpose of this screen in the original maf housing is to regulate turbulent airflow. With a smoother stream of air hitting the maf sensor it makes for a much cleaner and smoother reading, which gives smoother idling in general and eliminated the codes. Have not had a code thrown since. You can see it here to see what I am talking about. I removed the small black screen at the opening air intake side.

http://www.ebay.com/itm/New-Mass-Air...5UDQhV&vxp=mtr

Hope that makes sense.

To answer the other questions.
Yes... the 82mm Competiton plenum and throttle body will work with the K&N setup. Just takes a little muscle to fit the K&N hose connector, but it will fit on to the Gt3 TB.

Here is the honest truth. If you are NOT planning to do any exhaust or catalytic mods then the 82mm setup will only gain you a few hp at the very top end. With an ecu tune this may benefit the setup more and you may see a few more hp on top of that. With a freer flowing exhaust, gains of 10hp have been dyno'd using the 82mm setup over the stock 74mm setup.

Here is another honest observation. To mimic the stock airbox setup K&N uses a 74mm tube that matches right up to the stock 74mm throttle body. The K&N also has an 82mm 4 inch section where the Mass air flow sensor is housed. You can see the tube is bubbled where the sensor goes in. This also mimics the stock airbox that has an 82mm maf sensor housing and then shrinks down to a 74mm throttle body rubber connector.

So this leads me to a big question. Is adding a 82mm throttle body and plenum that mates to a 74mm air intake tube the most efficient setup?? ideally you would want the intake tube and throttle body the exact same size for efficiency, correct?. So in this scenario the bottle neck is the 74mm intake tube of the K&N. Yet, does the added airflow of the K&N provide enough airflow for the 82mm throttle body and plenum to be unhindered over a stock porsche airbox like the 997.2 that has an 82mm maf housing and air intake tube all the way to the throttle body?? hmmmmm.
The stock airbox rubber connector will slip on over the GT3 throttle body. I did it and will attach a photo. But going back to oem airbox means going back to the not so exciting sound too...

My current setup is 74mm K&N intake tube mated to my oem 74mm throttle body and 74mm IPD plenum.

The minute I open up the exhaust and get an ecu tune I will be adding the competition plenum in a heart beat.

If you still would like to try a competition plenum and gt3 throttle body with your ecu tune... I have one for sale!


oem air box connector attached to GT3 throttle body

 

What a helpful and informative post. Just gave you some Rep points ! Nice work.

 

Thanks

 

Man thanks!!!

Did you notice a difference from the K&N and stock setup to the k&N and standard ipd plenum?

 

I installed the IPD Plenum 1st, which I felt made a nice difference. This modification will greatly improve your throttle response and especially the power curve between 4500-5500 rpm is greatly improved. Porsche's have a slight flat spot in power between 4500-5500 as the engine cam is kicking in and intake manifold valve adjusts.

Both the IPD Plenum and the K&N Intake kit greatly improve this area as stand alones. With either the K&N intake OR the IPD Plenum the Dyno charts show greatest power gains of 20+ horsepower in 4500-5500 rpm with about a 10-15 hp bump near 7000 rpm. The IPD plenum is closer to $800 with similar results as the K&N kit. I have both and It seems that both together worked out really nice for me. I did notice a nice difference after adding the K&N to the ipd plenum. They of course do not produce 40 hp together, as most bolt ons are not worth their advertised hp each when combined with other parts, but work really well as a unit. I feel that the K&N does a real nice job all by itself to make a noticeable power increase between 4500-5500 . OH, and the sound! The sound alone is worth $300 bucks.... the sound is really great. Seriously adds a real nice intake scream/howl from 5000-7300 rpm.

Which ever you get 1st will make a nice difference. Adding the 2nd intake mod will at that point be the cherry on top, but the 2nd choice is probably not going to make as much improvement as advertised, because you already improved airflow with your 1st choice. The IPD does add a nice improvement in airflow smoothness. At that point the 2 intake mods seem to reach a limit and you need to upgrade the throttle body and the exhaust system. To get the maximum you will have to add a ecu tuning upgrade and exhaust to get the max from bolt on power.


I would get the K&N first and think you will be happy. If you are still itching to add an ipd later I think it will be a nice improvement but not a huge difference in power since the K&N has improved a lot of the air flow already. Hope that makes sense... .