Installed Greddy Intake, kept stock snorkel.
 

Title pretty much says it all. I installed the Greddy Momentum intake. The instructions said to remove the stock snorkel, but the opening for the intake fit perfectly so I just kept it on. Is there anything wrong with doing so? Did I ruin the purpose of even putting an aftermarket intake on? I still can feel the power boost and torque gain, also gives it a nice engine tone too.

Sorry man, but...

. Go back to stock
. Install a decent drop-in filter
. Remove or modify your existing snorkel for better airflow or just replace it with an HKS air duct
. Do a sound tube delete while your at it
. Get a tune!
. Sell your Greddy

And in that order! If someone would have gave me these instructions months ago, I would have saved alot of money on intakes ;)

Reason: Stock intake with a drop-in filter & tune is as good or better than any aftermarket intake


If you want to keep your Greddy, just remove and replace with modified snorkel or an HKS - Get a tune if you don't already have one

Thank you for your reply, I'm going to keep my GReddy, I am getting a tune down the road as well.

Agree with @JPxM0Dz

If you don't want to modify your snorkel then taking it off is better than keeping it.

Don't forget a smoother inlet tube with the drop in, then you are set.

Keep the stock snorkel. It's not hurting anything. When AEM was designing their intake they flow benched their setup and with the snorkel attached it flowed around 500 CFM, which will support a bit more horsepower than these motors make. It's the only place I've ever seen an intake for one of these cars actually flow benched. It will probably support 250-275 HP if I remember the old rule of thumb from my drag racing days.

You may want to look into the Perrin 3". Looks pretty promising especially for full bolt ons.

You definitely want to look into a tune though it will wake the car up.

Taken from a software tuning thread :bonk:

So is everyone else who showed an increase in power with drop in filters on a dyno incorrect? It seems we have conflicting reports on if drop in filters make power. If filters, why not the snorkel?
And what were the repeatable gains? Something like 2-3 HP? Well within the normal variance of measurement, I would think. That's like a 1-2% difference? I mean, you can take it off if you want, it won't hurt anything.

A gain is a gain, I'm not trying to be nit-picky here but some people will want it and some people won't care. Why not be informed?

I wasn't arguing anything else so I'm not sure what you were getting at with the drop in filters.

I'm running a K&N drop-in filter, DSport did an extensive test on the intakes compared to drop-in filters. Very similar results, I think short-rams/cold-air intakes are mostly for show and the annoying ricey suction sound for these cars.

Sure, there may be gains for other cars, but very marginal from all the tests. And like how everyone has said, get a tune; I'm running the Vishnu tune with the K&N, sounds great to me and I can feel a difference.

I thought about removing the snorkel completely, but decided not to. Take a look at the point of attachment to the stock box, the engine can evidently intake heat from the engine, often referred to as heat soak. So what I'm going to do is keep the snorkel on, but cut off the fresh-air tube -- many folk have already done this. The idea is to filter out any potential hot air seeping into the intake.

The stock box with a drop-in is more than enough, you can take it a step further and get a replacement intake hose (I just bought a Mishimoto). Wont have to worry about dealership giving me crap for having a new intake/engine mods.

.ck

yeah I've seen a lot more threads springing up where its about someone modding a snorkel like @Yruyur or they've mentioned that they already have or are interested in it.

Good info in this thread. It also goes to show that the engineering for this vehicle is pretty sold on the intake side for a full blown intake to not have much effect. Either that, or there is a restriction plate in front of the mani....which makes not sense on a low hp car that has no racing requirement.

The intake on the WRX/STI has long been proven to flow more than basic bolt-ons will require. Nobody really changes out the intake unless they want more sound and/or going ginormous turbo.

The sound change had no influence on buying an intake for me. It was simply to try and give the car a little more power. If you dont have thousands to drop on a turbo or s/c, anything helps for additional hp & t/q gains.

I tried The K&N oiled drop in. I didn't feel any much of a performance gain. Then after installing the Greddy intake without the snorkel. I felt a performance gain. No numbers but I feel a gain. Greddy recommended to take the snorkel off. I wanted to leave the snorkel on but I removed it. It was a pain to remove, but if I wanted to get their claim of "HP: upto 9*hp increase, 2-3 peak and TRQ: upto 10*ft-lbs increase, 6-7 peak". The car needs all the boost it can get. I didn't drill a hole for the sound tube but kept the sound tube installed. I left the sound tube so when switching back to stock for smog certification the intake looks completely stock. I'm not sure not having the snorkel will effect smog certification. I don't want to reinstall the snorkel. You can hear the intake so much more than with the sound tube. I have the dry element filter. The K&N filter is oiled and they can contaminate the MAF sensor. I went through that with my Tacoma 4x4 and I had to buy a new MAF sensor even after cleaning with alcohol. No more oiled filters.
Overall I like my Greddy intake. If someone can make an intake with better performance gains, I might give it a try.

I was on a dynapack dyno stock airbox and factory filter made a pull 199hp opened air box dropped in a k/n made a pull 200hp thats it. Went to Airaid bolted on a cold air intake system while on their Mustang dyno picked up 4 hp they work.

Hey I just wanted to answer the OPs question as this is info we obtained while testing intakes. I would STRONGLY suggest taking the time to remove the OEM snorkel, as the car runs extremely lean with it equipped.

Greddy, No Snorkel
http://www.grimmspeed.com/content/im...snorkel4th.jpg

Greddy, OEM Snorkel
http://www.grimmspeed.com/content/im...snorkel4th.jpg

Greddy Before and After Snorkel
http://www.grimmspeed.com/content/im...compare4th.jpg

So you can see the results are consistent, and are not favorable with the OEM snorkel, so I'd remove it. Sorry I saw this thread so late!

Chase
Engineering

According to about 50 dynos Toyota/Subaru have already made a better intake..just need to put in a filter

Intakes are a waste of money. Just get a drop in filter and a intake tube that deletes the stupid noise generator.

What's right for you isn't right for everyone, although I am inclined to agree that the budget-conscious performance oriented person should get a hi-flow filter in lieu of the entire intake.

I got a grimmspeed intake for $200, factoring in the group buy price and the money I got from selling the stock box. $200 is nothing. People spend 1k+ on catbacks. To each their own brotha... that's the beauty of it all :party0030:

Hey I don't always follow my own advice either, as I ended up grabbing one from the GB myself :bonk:
http://s23.postimg.org/y2wxde1dn/20141118_120730.jpg

I removed the stock snorkel when I installed my Takeda V2 (Same design as the Greddy).

Only because the instructions told me to.

You don't have to remove the front bar to remove the snorkel BTW. I simply unbolted the top of the bar, removed the thin bolt plate and then had a buddy bend the top of the bar back slightly while I snaked my hand in with a socket and undid the three bolts underneath.

Then you just pull the snorkel out of the space made by bending the top of the bar back. Bending the bar doesn't damage it at all, it's meant to flex.