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Old 05-02-2019, 01:32 AM   #1
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Stock airbox intake flow (pics)

During my research on a custom intake, i never did see a pic of the stock airbox opened. I heard how restrictive it was and wanted to see it for myself. It does look turbulent, as the air takes multiple turns before going through the maf.




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Old 05-02-2019, 03:09 AM   #2
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Stock airbox sucks and is barely adequate for 2.5l.
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Old 05-02-2019, 03:55 PM   #3
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Thanks for posting this. A picture is worth 1000 words! Always wondered what one looked like on the inside.
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Old 05-02-2019, 03:56 PM   #4
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Forgot to ask...so whatís your design for a custom intake look like?
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Old 05-02-2019, 04:16 PM   #5
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Put in a 987 air box.

987 v 986 Air box

maf and throttle body diameter
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Old 05-02-2019, 04:43 PM   #6
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Gotta be something easier than doing that. Watched a few you tubes including Newartís and man what a pain.
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Old 05-02-2019, 05:05 PM   #7
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before it was figured out that the 987 airbox fit in the 986, i tried one of those carbon dynamic airboxes (cda) and just not enough room in there. about the only other valid solution i've seen is i think the fabspeed 987 solution that put an air filter in the gap between the rear quarter panel and the engine bay.
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Old 05-02-2019, 05:07 PM   #8
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Originally Posted by Jgkram View Post
Gotta be something easier than doing that. Watched a few you tubes including Newartís and man what a pain.
Sure, if you don't want cold air induction.
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Old 05-02-2019, 05:23 PM   #9
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Gotta agree with the King on this one. Iíve seen a couple of the fabspeed design mock upís in our cars. Cleaner design, leaves A LOT more working room in the engine bay and itís still a true cold air intake. Much easier than squeezing 10 lbs in a 5 lb bag.
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Old 05-02-2019, 05:55 PM   #10
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Originally Posted by Jgkram View Post
Gotta agree with the King on this one. Iíve seen a couple of the fabspeed design mock upís in our cars. Cleaner design, leaves A LOT more working room in the engine bay and itís still a true cold air intake. Much easier than squeezing 10 lbs in a 5 lb bag.
You will get more air with the kit FabSpeed offers, but it's not a cold air induction kit like the 987 air box is. For $400, not worth it to me.

https://www.fabspeed.com/porsche-986-boxster-evoms-v-flow-air-intake-system/

The 987 air box fits perfectly fine in the 986, you just have to move some stuff out of the way to get it in there. Is it easy to install, nope, but IMO, well worth the time and effort.

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Old 05-02-2019, 06:03 PM   #11
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Originally Posted by KRAM36 View Post
You will get more air with the kit FabSpeed offers, but it's not a cold air induction kit like the 987 air box is. For $400, not worth it to me.

https://www.fabspeed.com/porsche-986-boxster-evoms-v-flow-air-intake-system/

The 987 air box fits perfectly fine in the 986, you just have to move some stuff out of the way to get it in there. Is it easy to install, nope, but IMO, well worth the time and effort.

sorry, i wasn't referring the 'hot' air intake, but this guy ...

https://soulpp.com/product/porsche-987-1-cayman-boxster-pcs-innovations-high-flow-intake/

edit to add the fabspeed version ...

https://www.fabspeed.com/porsche-987-2-boxster-cayman-competition-air-intake/
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Old 05-02-2019, 06:34 PM   #12
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Why in the world would you install that on a 987? As for the first link saying it will block water from getting into the system, I find that hard to believe, but possibly manageable on a 987, but on a 986? Also the claim of 12 whp gain on a 987 I find hard to believe.

The $800 lol FabSpeed kit doesn't even address the water issue, but they do say it's for competition.

They are interesting, would be much easier to install, but I'll stick with my 987 air box. It works perfect.
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Old 05-02-2019, 09:14 PM   #13
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Holy balls!
$400 for a couple pieces of tubing?!?!

...and $800 for basically the exact same thing from FS?
That is laughably stupid!

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Old 05-02-2019, 10:00 PM   #14
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Holy balls!
$400 for a couple pieces of tubing?!?!

...and $800 for basically the exact same thing from FS?
That is laughably stupid!
But donít forget... you get a ďpermanentĒ oiled air filter and a cool mounting plate too!
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Old 05-03-2019, 03:26 AM   #15
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I have to agree that the 987 box is much better than the stock setup for sure. And you’d have to be an idiot or a billionaire to buy $400 - $800 worth of plastic/rubber tubing. However, I still see a lot of merit in the design. It’s simple, free flowing, utilizes a space that is protected from engine heat and readily available, lighter, etc. What I struggle with are the water entrainment issues. On most of my other cars the intakes are located in the front grill and direct the air (more or less) straight back to the throttle body in a very short distance. On the Boxster, while some water may enter the air duct, it would still have to get through a filter and travel you heck of a long way before reaching our throttle body. What am I missing?
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Old 05-03-2019, 06:46 AM   #16
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well, $800 is stupid, but $400 not so much. you do a 987 airbox it will cost you $200 or so with txes and shipping, at which point you have to do a bunch of fabrication (time = $) and buy couplers, joiners, elbows, hose clamps, etc. i mean, the gas for the multiple trips to the post office/hardware store adds up, you know?

the water issue is a red herring. one guy on planet 9 installed one and drove it in a torrential rain and saturated the filter. became a big deal, impacted sales, so now vendors are trying to mitigate it. with my 987 air box, and the trimming i have done to the filter hanger, etc., there is a clear shot from my filter to the great outdoors (rain and all) and never had an issue.

otherwise, it is easy to fabricate and there is a how-to on this forum. a piece of lexan cut into a trapezoidal shape, a cone filter, and some silicone/couplers.

my review of it was this: resistance to airflow caused by the air filter is proportional to area; the larger the filter surface area the better (hence why the 987 air box is such an improvement over the 986 unit). measuring the inside of my fender well, there was no way i was going to fit a filter as big as the one in the 987 airbox.
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Old 05-03-2019, 06:47 AM   #17
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Just as a point of reference, I'm looking to revise the air intake for my 03 Boxster S. The Evo product looks pretty nice and would be easier to install. The 987 airbox makes sense, but is a bear to install. The price for either is about the same. For the 987 pieces, Ebay has them all, but it looks to be about $400 total, the airbox, tubes, throttle body and plenum. In my mind, the only reason to do either the Evo or 987 is to get the 74mm TB and greater airflow.

As to whether one or the other is a "true" cold air intake, the Evo looks to be sealed around its perimeter, and the 987 box is self contained. Both draw from the same source. Is one significantly warmer than the other? Dyno charts for both are about the same. Fabspeed published dyno runs for incrementally modified 986s. Eventually they ended up at the Evo airbox, full exhaust system and their ECU tune. I believe the final increase was 27-30 hp above base.
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Old 05-03-2019, 07:14 AM   #18
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Originally Posted by Elmer View Post
Just as a point of reference, I'm looking to revise the air intake for my 03 Boxster S. The Evo product looks pretty nice and would be easier to install. The 987 airbox makes sense, but is a bear to install. The price for either is about the same. For the 987 pieces, Ebay has them all, but it looks to be about $400 total, the airbox, tubes, throttle body and plenum. In my mind, the only reason to do either the Evo or 987 is to get the 74mm TB and greater airflow.

As to whether one or the other is a "true" cold air intake, the Evo looks to be sealed around its perimeter, and the 987 box is self contained. Both draw from the same source. Is one significantly warmer than the other? Dyno charts for both are about the same. Fabspeed published dyno runs for incrementally modified 986s. Eventually they ended up at the Evo airbox, full exhaust system and their ECU tune. I believe the final increase was 27-30 hp above base.
If you think that EVO air box is sealed, you're sadly mistaken. You are correct, if you're going to do the air box, you should do the full intake system, including the larger throttle body and intake pipping. I would say on a 986 3.2 engine, just doing that you're looking at around 18 HP gain. I don't have a tune on my car, but with my mods, I'm getting around a 30 HP increase.

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the water issue is a red herring. one guy on planet 9 installed one and drove it in a torrential rain and saturated the filter. became a big deal, impacted sales, so now vendors are trying to mitigate it. with my 987 air box, and the trimming i have done to the filter hanger, etc., there is a clear shot from my filter to the great outdoors (rain and all) and never had an issue.
Your 987 air filter is much larger and would not be saturated by water as easily as the smaller air filter on that $400 kit, plus the 987 air box has the filter inside the air box and not sitting right in the smaller vent area of a 986 like the $400 kit. I waited 2 years to clean my K&N air filter and when I pulled it out, there was plenty off clean area on the filter as to not starve the engine for air. After cleaning it, I didn't even notice a difference. There are trade offs going either way, if you never drive in the rain, then that $400 kit would be a decent upgrade, but if you want the best all around air box for the 986, put in the 987 air box. Yes it's more labor intensive, but worth it IMO. I'm still scratching my head why anyone would put the $400 kit on a 987.
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Last edited by KRAM36; 05-03-2019 at 11:22 AM.
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Old 05-03-2019, 08:29 PM   #19
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I would have went 987 airbox but the difficulty in fitting one in swayed me away.

I'm still working on my new setup but for now its an aluminum airbox with a cone filter inside, a snorkel attached on the outlet, fed to the side vent. I cut off the snorkel piece on the stock airbox and used it as a block off plate and used foam tape to seal any possible gaps.

So far I've been seeing 20F above ambient(60F average days) in city and 5-10F on hwy.



My mods now are 3 inch intake tubing(airbox inlet/outlet is 4inch) 997 throttle body and plenum. Headers and catback.
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