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Cold Air Intake Question

11K views 40 replies 12 participants last post by  zach91290 
#1 ·
#2 ·
No it wont work. The WRX/STi air intake is routed differently due to the turbocharger system. You need something that would either connect directly to your throttle body (check out Injen for this) or something that connects to your filter box (Ganzflow). I would reccomend the injen myself, but people use the Ganzflows and report good results with them.

Rallitek carries the Injen
http://www.rallitek.com/iminsy.html

Ganzflow can be found here
http://www.subaruplanet.com/ganzflowintake.htm

Hope that helps
 
#7 ·
I have never heard of or seen that intake. I would be wary of it because it says it fits both the WRX/STi and the RS. Thats a big red flag because the intakes for the turbo motors go under the intake manifold into the turbo, whereas the NA setup does not have enough room under the manifold for an intake tube to pass through. Long story short, anything designed for a turbo application will NOT fit an NA setup and anything designed for an NA application will not fit a stock turbo setup. I would never buy any product that says it would fit both a Subaru NA motor and its turbo counterpart.

As for the question about short ram vs CAI, it all depends on what you want. Short rams do not suffer as much from low end power loss like the longer CAI's do. But their advantage at the top of the RPM range disappears unlike the CAI's. Why? Its all related to the lengths of the respective intakes and what the length does to the intake air velocity across the RPM band. CAI's are longer than short rams, hence airflow efficiency at low RPM is not as good as the short ram. Its important to note that these losses are not too much however. CAI presents the risk hydrolocking or ingestion of water into the engine, but it would take a significant amount of water to do that I think. I have never heard of it happening.
 
#8 ·
You can modify your stock air box to run CAI and use a less restrictive filter then stock. Use a straight piece of 3" ABS from the box into the inner-fender (or 90 degrees pointed to the back of the car).

Use some silicone (black) to seal the box and pipe. Use any non-oiled filter (MAF cars), HKS, paper STI, etc.

This is of course after a 'snorkus' delete. It will run as well as a $250 CAI or short ram intake. Be sure to reset the ECU. I just ran Injen for the 'bling'...
 
#11 ·
Disconnect the battery, depress the brake pedal, and turn the ignition as if you were trying to start the car and hold it there for five seconds. You should see your electric odometer go blank.
 
#21 ·
Sorry, I forgot to answer this in my other post. The ECU will relearn with the new mods. It will find the best trim settings by itself. It takes some time though, when I run 30% E85 it takes about 70 miles or so to really learn the new mods/fuel composition.
 
#18 · (Edited)
Well I've only had mine on for a year, and I haven't had any issues in the snow last winter or the heavy rain we've gotten lately. I dont snowboard tho, so i dunno about how tahoe would affect it. As long as you keep your fenderwell out of water and snow, it should be fine. Injen also sells a hydroshield to cover the filter, and I put that on so that may make a difference.
 
#15 · (Edited)
A snorkus delete intake is a good idea. I have a PDM intake which is basically a 3" aluminum pipe that runs to the stock airbox. I'm in the process of retrofitting a 3" elbow into the airbox to get even more flow while still retaining the box. Well here's a link to my newly finished intake making it a true 3": http://www.rs25.com/forums/showthread.php?t=84807

The Ganzflow is in fact a snorkus delete intake. Now let me propose one other less expensive idea. If your good with a hacksaw you could probably buy a couple 3" aluminum 45º bends (http://cgi.ebay.com/ebaymotors/3-Aluminum-Elbow-Pipe-Air-Intake-Intercooler-45dg-bent_W0QQcmdZViewItemQQcategoryZ38634QQihZ025QQitemZ380042123656) and cut them down to fit and assemble them using a 3" to 3" coupler (http://cgi.ebay.com/ebaymotors/3-Silicone-Coupler-Reducer-Adapter-Intake-Intercooler_W0QQcmdZViewItemQQ_trksidZp1742Q2em153Q2el1262QQcategoryZ38634QQihZ025QQitemZ380013312244) and a 3" to 2.5" coupler (http://cgi.ebay.com/ebaymotors/2-5-to-3-Coupler-Reducer-Air-Intake-Pipe-Intercooler_W0QQcmdZViewItemQQ_trksidZp1742Q2em153Q2el1262QQcategoryZ38634QQihZ012QQitemZ220262338196) to attach to the stock airbox. It would probably be $50-75 for the whole thing. I'm just thinking I have an 04 so I have a MAP sensor. An MAF car would require a slightly different approach. Mounting the MAF between the two 45's should be easy enough though with the right couplers.
 
#33 ·
ok, now i'm looking at buying a cheap pipe from ebay or something, and putting a better filter on it, with a hydro-shield or go SRI...

Now this filter:
says it fits a 97-01 subaru 2.5rs
My Subaru is an 05, but everytime I open my hood, I still see this intake fitting in there although it doesn't have a fit for my date. Would this pip fit an 05 RS? I think so, but I would like some second inputs...

 
#38 ·
Heres Something another member let me in on. Ebay sells a "ganzflow" style intake pipe for $30 shipped. However you wont find it under any impreza searches. Look up short ram intake for 94-97 honda accord. or just click the link!!!
http://cgi.ebay.com/ebaymotors/SHOR...m14QQhashZitem380068449049QQitemZ380068449049

this is what it looks like....


the only things needed to be done are plugging up the vacuum line opening, and cutting off approx. 3/4 to 1" of tubing at the end where it goes into the fender. Obviously you wont need the filter that it comes with or the vacuum hose but for 30 bucks it was worth it for me!
 
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