IPD Plenum - best performance mod?
 

Does anyone have experience with the LN Engineering IPD Plenum? Is their claim true - best performance mod you can install on a Boxster?

"All 986 Boxster IPD Plenum applications are designed to utilize the larger 74mm Porsche throttle body. The combination of the patented "Y" design of the IPD Plenum combined with a larger TB allow for improved air flow and intake air speed. The IPD Plenum is the absolute single best performance mod you can install on a Porsche Boxster. **Requires upgraded 74mm Porsche throttle body."

This is similar the the throttle body upgrade some diy. I will be doing this mod next on mine, but its following a muffler change i just an fvd brombacher. Hopefully someone thats has it installed will chime in, but larger throttle body equals more go juice so should be more power. Thoretically.

For $800 it's not worth it. Just get the 997 Distribution T for around $70 part number 99711041603.

I have a 98 with the 2.5 motor. I already installed the larger throttle body from a 996. I think the T on the 2.5 is the same size as the 3.4 T in the 996. It bolted right up. The throttle body from the 2.5 is the same OD as the 3.4 TB, the ID is the only difference. So what i'm saying is I'm not sure if the IDP would make a difference on my car or not. I'm pretty sure it wouldn't make an $800 difference. Maybe on a 2.7 of 3.2 it would?

Changing the plenum alone probably would net 0 gain, the real increase in power is from the larger throttle body. Was on the fabspeed site the advertised claim for a 986 is 30 to 35 hp, depending on mods. Personally I dont think there is that much to be gained, but they have dyno tables. Also is $1200 if you get the whole set up. Fact of the matter getting much more hp from the 986 is pricey per hp.

My plan is multifaceted, exhaust, plenum tb, software tune, sport cats, software tune adjusted. I think that will get about as much usable hp from bolt ons available, with the exception of better headers. Is it worth the cash, depends on the individual.

This is spot on. Go full tilt on the mods as they complement each other. However with a "Crios" mod on a stock muffler (more sound gain then anything) I felt the most power gain with the full intake system change. I then put headers, secondary cat delete pipes, Borla muffler and felt a power gain, but not as much as the intake change. I do not have a tune done to my car, but calculations shows with all these mods I picked up around 30 HP. Been running this setup since 2015 and I'm very happy with it.

Did all the work myself, so no cost there other then my time. The only headers on the market that will fit a Tiptronic car without mods to the cooling hoses are the NHP 200 Cell Exhaust Headers and they cost me $1,200 at the time I got them, but they do have cats in them and my main cats where bad, so they where cheaper then replacing them with factory exhaust manifolds with the cats built into them. The Borla muffler sounds good, but the piping seems to be too small. I had to have the ends of the Borla muffler stretched wider so the secondary cat delete pipes would fit into the muffler.

Question if you change the iPad do you have to do a remap?

Getting a new iPad will not effect the fuel map. ;)

Might Depends if your going with a iPad pro or not! :D

IPD makes an excellent product that is performance tested. They have done several things which improve air drag internally that the other options do not have. Dimpling the interior, smoother radius's, rear air divider with holes to eliminate opposing side flow oscillation turbulents. I'm not saying any of the other option will not give a noted result. More air in produces more power out. The IPD maximizes all the know problems Boundary air, Oscillation, and radius transitions. The others may improve 2 of the 3 but no other addresses all 3.

Coupled with a good flowing exhaust (full NHP) and remap I was able to keep up with 3.2 Boxster's on track while I was still running my 2.7 2003 motor.

Look at my user image. That is a 2003 Boxster passing a New Cayman GT4 coming off the back straight at VIR, and it is not a one off event I have multiple video's of the same type pass.

The IPD Plenum is a nice piece, but it's not worth $800. Maybe if you're racing for money it might pay itself off in 5 years, but those people have already spent thousands of dollars upgrading from a stock engine. The 997 Plenum works great and is worth every penny you pay for it. Just can't say that for the IPD Plenum for normal people on a stock engine.

The 997 Plenum works great and is worth every penny you pay for it. Just can't say that for the IPD Plenum for normal people on a stock engine.[/QUOTE]

Kram: Are you saying the 997 Plenum is great except for stock engines?

I think its all opinion on the worth. I think $1200 for a tested engineered mod in a complete kit, is not that bad a price tag. Now the question is an individual question as if its worth it to them.

Point is everyone has different values, and we are a limited market for a seller when it comes to research and development they have to have a ROI.

How much HP do you think this $800 IPD Plenum is going to give you over the $70 997 Plenum on a stock 3.2 Boxster engine? 1 maybe 2 HP maybe none?

It seems this 997 Plenum has been seen and used a lot for mods as when I bought mine back in Jan 2015 it was only $34 and now it's $70, but still worth every penny at the higher price IMO.

What $1,200 complete kit are you talking about?

No, where did you get that from? I said the 997 Plenum is perfect for a stock engine.

Thanks guys, I appreciate your opinions. Engines to me are fancy air pumps so I tend to agree that more air in, better flow out - always makes a better breather. Seemed to be a big claim - so just wanted to know what others thought. Thanks!

Fact is the IPD flows 15% more air than the 997 stock plenum with a 74 mm Throttle-body. The geometry of the stock 986 and 997 "T" does nothing to manage the turbulent caused by the "T" shape. Where the IPD does.

This is FACT?
Can you point me to the independent verification?

15% more air under what conditions?
WOT at 6k? Or, what, exactly?

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Say we give him the benefit of the doubt that at some point the IPD Plenum will flow 15% better, most likely at WOT on a modified 3.2 engine. Add 15% to the cost of the 997 Plenum, that would put the cost at $80.50, so where does this $800 become justifiable? Like I said, what HP do you gain from buying the IPD $800 Plenum over the 997 $70 Plenum? You're surly not going to get 15% more more HP with the IPD Plenum over the 997 Plenum and you're paying 1,045% more for that IPD Plenum. Let that sink in a bit 1,045% more then the 997 Plenum?

BTW: The 997 Plenum has an excellent outer radius on it's Y shape, it's not just a T shape.

https://i.postimg.cc/pLNzk6YN/997plenum.jpg
https://i.postimg.cc/QdtH3LgK/997plenum.jpg

Does this radius matter? According to Jake Raby it does.

https://rennlist.com/forums/996-forum/944002-alternative-to-ipd-plenum-2.html#post13767949

The plenum alone isn't where your adding hp gain, you have to include a new larger throttle body. I not arguing one is better than the other, because i cant say, but before you start saying $800 you need to read up on what is needed to get the power gain.

The IPD vendor claims power gains in throughout the whole rpm range with most gains in the mid range.
Fabspeed is now selling the ipd plenums as well, another reputable porsche tuner, so that has to say something.

As i pointed out its a matter of opinion, as for worth.

I need to read up on it? I have installed a full intake system upgrade, so yes I know just installing the 997 Plenum isn't going to give you all the benefits it offers without doing a full intake upgrade. As for the TB, both Plenums are for the larger TB.

I'm not saying the IPD isn't better, it's just not 1,045% price wise better. The HP gain between the two on a stock 3.2 wouldn't even be noticeable. Save yourself some money to pay for the rest of a full intake upgrade. You can get everything needed with the extra $730 saved and have money left over.

Lol, Fabspeed is selling it, so that gives the reason to buy the IPD Plenum?

Fabspeed is selling the older style IPD Plenum and for $1,120, what a joke Fabspeed is.

https://www.fabspeed.com/porsche-986-boxster-ipd-intake-plenum/

Sorry I knew chiming into this conversation was a wasted effort "I'm out been here before".

C'mon...... really?
Because I asked for a little more information on something you said is fact?

I hope you're not suggesting that when you say something, it's above question?

It sounds to me like you've got something of value to add to the conversation, and i'd hate to see you split just because I offended you by asking for some additional information to your very specific claim.

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Does the 997 plenum drop right in on a 3.2 or do you have to change some additional parts? (ie: throttle body and/or the piping from the airbox)

No, it's shaped completely different then the stock Boxster Plenum. Two threads you need to read through.

Air box thread.

http://986forum.com/forums/performance-technical-chat/32074-987-v-986-air-box.html

Intake thread.

http://986forum.com/forums/boxster-general-discussions/31693-maf-throttle-body-diameter.html

I am not saying that either, just pointing out that several vendors that seem to have a good review are selling it. Not only fabspeed but fvd, whom i did discuss the pros and cons with.

I only mention the TB because you keep referring to the plenum alone, just for sake of discussion need to clarify you need a throttle body.

As for myself I dont like piece milled mods even if they work, I rather have a mod designed for application.

Not sure why all the sarcasm, but its these small companies do our community a service. Not saying they maybe hype the numbers but they do post dyno readings for what its worth.

For what its worth I appreciated the input, since you actually have one installed!

What sarcasm? Fabspeed is a joke with their prices and I'm dead serious. Since you think the number of places a part is sold makes the part worth buying. Well the 997 Plenum can be bought at many more places then the IDP Plenum. I see zero relevance of where you can buy the part making it the part to have. It's only companies trying to make a buck off of hype and in Fabspeed's case, adding another $400 to the price of the part.

It's been 4 years since I installed my full intake setup and it's been a complete joy the entire time to drive and all the parts needed to do the full intake mod cost less then the IDP Plenum alone.

You cant knock a company for trying to make a buck, research development is expensive. I never said that the number of places selling an item has relevance to weather it meets stated facts on its performance. I am just pointing out that vendors with a decent rep are selling the part. Your diy uses stock parts which i would hope are more widely available. So far you have bashed fabspeed and ipd just because you think they are over priced in your opinion doesn't mean others have an opposite opinion.

You keep saying your mod is better you have no fact either way, yes it works well. Another poster has the ipd installed is happy with it. the question which is better solution can only be proven by someone taking the time and expense to install each the run dyno.

I have read the thread several times on that mod and I personally don't want to do it, i would prefer a different options. Thats my business.

I never once said my setup was better, I actually said the IDP Plenum is the better part, but not worth the price.

If you don't want to do this mod why are you even commenting? What other options are you talking about? If you're talking displacement increasement, you're going to want an intake upgrade too. The current stock intake starves the 3.2 of air and hurts the power the engine can give you.

I so totally get this. I'm that way with computers. Gimme a laptop with the bells-n-whistles... don't make me figure-out how to add something to it. My mind just doesn't work that way.

But with cars, on the other hand, I am much more comfortable, and would actually much prefer to assemble my own "kit", and do my own trial-and-error of something new that hasn't been thoroughly fleshed-out yet. That's why I've never owned a Camaro: there's nothing new under the sun that hasn't been done on a Camaro. haha.

But I'm very glad that there are people who support the aftermarket with ready-made kits and products, where someone has already figured-it-all-out. And I don't care what they charge for it. I'm with KRAM, that it's hard to rationalize $800 for something I could do (and have 90% of the benefit) for $75. But for others, that threshold is someplace else.

Plus: you can't argue with how pretty the IPD part is. But it's not very "stealthy" if you want people to not notice any modifications, haha.

Stealthy is not an issue with Boxstres, unless you fancy a glass engine cover...

Well.... stealthy to me means it doesn't throw any red flags at the emissions testing station. In my county, the first hint of that sort of modification and they'll send me downtown to get it looked at.

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I never saw any of your post stating anything positive about the ipd plenum only ranting on about the cost.

I am commenting because that is the next mod up, I will be doing and want to hear actual comments from anyone who has it installed.

Finally someone who gets my point, and yes hard to rationalize the cost but as I pointed out its an individual thing.

I said it was the better part, it's just not worth the extra cost. It's not ranting, it's my opinion. There is no way on Earth the IDP Plenum will outperform the 997 Plenum by 1,045% more, but if you have money to burn and just want to brag about how you waste money on over priced parts, go for it.

http://986forum.com/forums/597075-post21.html

If this is your next mod, you're going to be piecing things together. I could put together a complete system for you using some used parts as I did with my car and would happily sell it to you for $1,200. All you would need to do is install it or you could pay someone to install it for you.

Side note on the computers reference. I have built every computer I have owned and have custom water cooled my computers since 2007 and done some for those that wanted a water cooled computer. I ran a side business selling computers put together by me and saved people a lot of money. These were people looking for high end computers for gaming/computation. I went into businesses and built all new computers for them and installed them. I have even put in systems for businesses that never had computers and trained their people how to use them. Yes that's how long I have been in the computer business. Doing this allowed me to retire at 47 years old. Now days I don't mess with people or businesses, just family, but now I have computers sitting in my home doing crypto currency mining making me money on the side. I love building computers. My laptop I built buying parts off eBay and Newegg to put in the parts I wanted. It's faster then most people desktops.

Well "Best performance mod" is a tough question because it all depends on where you want to improve performance. Straight line performance is a different goal from lap time performance on a closed course.

My own "best performance mod" priorities for a track focused car:
1. Remove weight from the car. This improves acceleration, cornering, and braking. 200lb reduction is a huge bump in performance. It is also cheap or free.
2. Excellent Tires. The most overlooked performance upgrade that makes a huge difference in lap times.
3. GT3 A-arms. Allows you to use ALL of your contact patch.
4. Coilover suspension or lowering springs. Allows precise corner balance and quicker weight transfer.
5. Underdrive pulley. Practically free HP and improved reliability.
6. Exhaust. Mostly for weight reduction but there is a bit of high RPM HP available.
7. 3rd Radiator. These cars get heat soaked fairly easily in continuous lapping and HP falls off as temps rise. Keeping water temps below 220F makes a noticeable difference in performance.

After all of these things have been done I have shaved 5-8 seconds off a typical lap time. The car is now a formidable track weapon. If I needed a bit more top end for the long straights I *might* consider the plenum, TB, and tune, knowing I will have to pay stiff penalty points in my car classification for very little improvement (maybe 2/10ths) in lap times. Cost/benefit is really quite low on this so it would be a low priority.

YMMV

To me, that's all you need.

IPD instructions
 

Hello, new member here. I can't find any detailed instructions for the IPD plenum install on a 986, only for the 987? I think I'm missing something, watched all the videos on YouTube and my car won't start.