4 Point 0

They have the dyno charts on their site.

Here you go

Churchill

That's an engine with aftermarket headers and muffler bypasses installed. Those meager gains may only be possible because of those mods. Or the dyno charts could be BS, as they often are (viz: Fabspeed, which posts charts showing gains that nobody can ever seem to replicate)

whoddoo

Agree with Jnosol that the 991 air intake configuration works very well stock and that the best upgrade is to drop in BMC or K&N air filters that are less restrictive. In fact Fabspeed, used to offer a CF cold air intake that replaces the standard stock airbox and filters on the 991 but stopped making and selling as there was negligible gains for the money.

Churchill

I've never seen evidence that BMC or K&N filters make power on a 991. You got a dyno chart?

whoddoo

Did not say it made power only that the BMC or K&N filters offer as much benefit as the cold air intakes that have been offered. This is from the companies that were making these intakes.

AdamSanta85

I guess wanting to bump this thread to see if anyone ever installed one of these? AFE now has an $850 all plastic version which is fine by me.

I was digging through parts and noticed 991 3.4/3.8/4.0 Carrera, S, GTS, GT3, GT3RS all use the same exact airbox with exception of GT3 Touring because Porsche needed a little more power out of it because of lack of ram air from the regular wing. The Touring uses dual cones very much like this intake. Dundon Motorsport also sells a dual cone intake somewhat similar to this for like $6000...

I’m tempted to get it and do before and after dyno on my car. $850 usually doesn’t buy much for these cars.


https://afepower.com/afe-power-54-83...ystem#overview


https://www.dundonmotorsports.com/pr...-center-plenum

garfunkle

dun don kit comes with more.... TB and plenum too. Not saying that's work 5K more but the box is OEM which is $$$

AdamSanta85

Totally agreed. I meant it more to highlight that the dual cone intake thing has potential as both Porsche and they looked to that design to increase power on cars that came with our airbox. For $850 this thing might actually be good for a few horsepower and easily reversible. Might sound cool too.

The dyno chart they post looks legit... yes the car had headers for both runs which I don’t.

I’ve had a couple AFE intakes on cars in the past and I was happy with them. Nice quality. This is a little less exotic than I would like for a Porsche but at same time you couldn’t see it if you tried.

This is the Dundon manufactured intake

https://www.dundonmotorsports.com/pr...-center-plenum

garfunkle

850 is worth it for the sound. I hope it doesn't work though because I lost my job from Covid and travel shutdowns....

AdamSanta85

Ugh sorry man.

George from MD

Yeah right. A bunch of aftermarket shysters can extract 15 plus horsepower more than Porsche engineers simply from an air intake.

Enjoy your IBD plenums, your ridiculous tunes, air filters and the like while pretending your car has 50 more horsepower than it really has.

But don't ever take it to a racetrack and pretend you can drive.

garfunkle

If the standard airbox was so fantastical then why is it different on the 911R?

My car has extra HP; confirmed by dyno, and it makes me happy

AdamSanta85

Porsche engineers literally did what you are you saying they would have done if they could. They made a better performing dual cone airbox airbox to improve power for the wingless GT3 Touring that don't benefit from the ram air scoop on the winged cars.

thesaintusa

See them advertising on the MB World forums for many years, mainly for their exhaust systems.

Users of their products seem very happy. IF the OEM intake (with a panel filter) is the limiting factor, adding more surface area could make a difference, versus improving the flow with the same surface area

Could a pair of cone intakes make a difference? I think so. FWIW, there is a 'new' intake that E63 owners are going ga-ga over replacing the flat panel filters with cone filters and picking up .5 sec in the 60-130 mph times consistently. https://mbworld.org/forums/w212-amg/...ck-intake.html

As for why OEM manufacturers often design intakes a particular way is to limit sound or control/tune how the intake sounds. Personally I like the intake noise, but I am a 16 yr old kid trapped in an adult body.

AdamSanta85

Just called AFE for some more info. Looks like these will be on backorder until February. They have 10 kits being made (100% made in USA), 6 are sold. I might put it on backorder through my buddies performance shop as he is able to give me a great deal.

AFE said that they will be on black friday sale for $800 direct through them.

I read the install instructions and found this step interesting. It sounds like you cap off that sound tube that runs into the back of the car, at the point it used to attach to the OEM airbox.
https://afepower.com/media/catalog/p...83037r_ins.pdf