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Old 01-03-2010, 06:53 PM   #1
bushwahkhan
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Hey!

I have a 2009 Subaru Impreza 2.5i. I recently bought a cold air intake system from K&N (http://www.knfilters.com/search/prod...?Prod=57A-6044) and opened it up to install it today. Reading over all the papers that came with it, everything seemed fine. When I went to install it I was having problems fitting the silicone adapters to the intake box. After looking over it and then having a friend come by to look at it, we concluded that even the filter was too big and was not meant for my car but for the turbo'd engines. Even though at there site (http://www.knfilters.com/search/hp_search.aspx) it says that it will work for the 2.5. It was about $230 so it was kind of frustrating. Any comments would be appreciated..


I guess my question is.....Does anyone know a good site where I could find cold air intakes and some performance parts that will WORK with my N/A engine

Thanks!

~Alex
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Last edited by bushwahkhan; 01-03-2010 at 10:13 PM.
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Old 01-04-2010, 12:40 AM   #2
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Quote:
Originally Posted by bushwahkhan View Post


I guess my question is.....Does anyone know a good site where I could find cold air intakes and some performance parts that will WORK with my N/A engine

Thanks!

~Alex
All the good stuff will void your warranty.
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Old 01-04-2010, 01:29 AM   #3
chazly413
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Warranties cannot be voided by modifying your car. Warranty coverage can be denied, though, if the modified part could have possibly caused the damage in question.
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Old 01-04-2010, 01:41 AM   #4
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$230 for that?! It looks like a dryer vent tube, some $1 couplers, and an odd filter.

Please read my guide:
http://www.rs25.com/forums/f106/t801...build-faq.html

It's posted here in the NA section, but didn't get too much fame. Lots more popular over there. In short, don't waste money on an intake yet with NA Subaru engines. Honestly, $230 for an intake is crazy. Even if you found one that worked, you're looking at maybe 5HP at the max and possibly a loss in low end torque. Spend your money on wheels, tires, various suspension bits, an exhaust (for sound), unless you plan on replacing some heavy duty items like cams, ect. With a 2009, I would not advise totally taking apart a good motor.

Sorry if it's not what you wanted to hear, but believe me, if you listen, it'll save a lot of headaches and wasted cash.
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Old 01-04-2010, 10:17 AM   #5
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Quote:
Originally Posted by cmiovino View Post
$230 for that?! It looks like a dryer vent tube, some $1 couplers, and an odd filter.

Please read my guide:
http://www.rs25.com/forums/f106/t801...build-faq.html

It's posted here in the NA section, but didn't get too much fame. Lots more popular over there. In short, don't waste money on an intake yet with NA Subaru engines. Honestly, $230 for an intake is crazy. Even if you found one that worked, you're looking at maybe 5HP at the max and possibly a loss in low end torque. Spend your money on wheels, tires, various suspension bits, an exhaust (for sound), unless you plan on replacing some heavy duty items like cams, ect. With a 2009, I would not advise totally taking apart a good motor.

Sorry if it's not what you wanted to hear, but believe me, if you listen, it'll save a lot of headaches and wasted cash.

Thanks for the input! Trust me I am happy with this car seeing as it will be my daily driver and still dont even have 10,000 miles on it !! but I just wanted to get more power when I hit the gas because it feels sort of weak at times. I just wanted to do cams, headers, exhaust(I was gunna build my own) and an intake?......


Thanks I am going to take a look at your Post!
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Old 01-04-2010, 01:09 PM   #6
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If you did a hybrid intake, you would feel a difference at about 4k RPMs and above. Search around for the thread on hybrid intakes for your chassis.
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Old 01-04-2010, 01:29 PM   #7
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Quote:
Originally Posted by chazly413 View Post
If you did a hybrid intake, you would feel a difference at about 4k RPMs and above. Search around for the thread on hybrid intakes for your chassis.
Thanks! Yea im reading about it at work right now. But do you think that it would be better overall compared to a manufactured one?
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Old 01-04-2010, 01:32 PM   #8
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Quote:
Originally Posted by cmiovino View Post
Unfortunately, your writeup is likely given the "sure, watev" by the butt-dyno crowd, and typically found as truth and common sense (if not religion) after having experienced doing things the wrong way around.
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Old 01-04-2010, 03:40 PM   #9
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Quote:
Originally Posted by bushwahkhan View Post
Thanks! Yea im reading about it at work right now. But do you think that it would be better overall compared to a manufactured one?
For 50 dollars and the same gains, hell yeah it's better I'm running one now and I love it.
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Old 01-04-2010, 04:06 PM   #10
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Only thing I'm weary of with any type of intake is running lean... I know replacing piping and all that does not result in CELs, but is there any chance of long term engine damaged from changing pipe size or shape?
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Old 01-04-2010, 04:58 PM   #11
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Of course. You're gonna wanna tune the MAF for the new intake. There is a write-up around here about that.
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Old 01-04-2010, 05:44 PM   #12
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Yea i'm reading that write up right now actually haha. I was asking around here and some people tell me just to tune the MAF it could be almost $250?? Wouldn't you have to do that anyway if you get an exhaust?
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Old 01-04-2010, 07:37 PM   #13
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it could be free if you have a laptop, a buddy with a tactrix 2.0 cable and time to burn a tank of gas... For the CL part, atleast. if you want to tune the intake over the entire load range, which you should, it will cost the price of a wb02 sensor and the tuning tools (laptop, tactrix cable) or about $250-300, or a one time tune by a pro tuner. the intake is the only bolt on that requires a tune to be safest for your engine. things like an exhaust, headers, PnP benefit from tuning but dont require a tune to be safer for your engine.
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Old 01-04-2010, 07:55 PM   #14
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Quote:
Originally Posted by RaceFaceXC View Post
it could be free if you have a laptop, a buddy with a tactrix 2.0 cable and time to burn a tank of gas... For the CL part, atleast. if you want to tune the intake over the entire load range, which you should, it will cost the price of a wb02 sensor and the tuning tools (laptop, tactrix cable) or about $250-300, or a one time tune by a pro tuner. the intake is the only bolt on that requires a tune to be safest for your engine. things like an exhaust, headers, PnP benefit from tuning but dont require a tune to be safer for your engine.
Nice! thanks.

From what I am reading it seems that you do not really get any powergains from an exhaust even if tuned?


Here is my plan maybe I could get some comments/opinions?

I wanted to build a full exhaust from scratch? good/bad idea?
Wanted to start with a universal axelback.....Then maybe universal piping, although if I have not misunderstood, the stock piping is fine?

Headers
Cams
Intake---I was looking at this INJEN CIA First off it says it is for an 05 RS that should be fine for a 09 2.5i? I was going to use the piping to the stock airbox until I can get it to a tuner....

And then a tune....(Tuning if i am not mistaken will help me see the powergains of the intake with out so much loss of low end torque like if I put it on without a tune? haha....)


This is just to get started....also at the same time I am going to take all the advice from cmiovino's guide and do that suspension work at the same time.

Last edited by bushwahkhan; 01-04-2010 at 08:41 PM.
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Old 01-04-2010, 08:53 PM   #15
chazly413
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^ You'll get gains from headers, but everything else will be negligible without some engine work. Get a cheaper intake for a hybrid, also.
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Old 01-04-2010, 09:11 PM   #16
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Quote:
Originally Posted by chazly413 View Post
^ You'll get gains from headers, but everything else will be negligible without some engine work. Get a cheaper intake for a hybrid, also.
Engine work..as in a flash of the ECU?

I was just going to do the hybrid until i could get my car to a tuner then add the rest of the cold air attachment but that intake would fit the 09 huh?

Sorry quick question regarding exhaust....what if instead of doing a custom one I
just bought a catback exhaust, kept stock cat(for now), then added new headers...would I be able down the road to change from the stock cat to piping and just have it connect to my catback and heads?
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Old 01-04-2010, 09:34 PM   #17
chazly413
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You can leave the cat unless you really want to get rid of it. And engine work means like cams and perhaps some work to the engine internals and stuff.
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Old 01-04-2010, 10:08 PM   #18
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Quote:
Originally Posted by chazly413 View Post
Warranties cannot be voided by modifying your car. Warranty coverage can be denied, though, if the modified part could have possibly caused the damage in question.

So according to you if i put street cams in my car it wouldn't void my power train warranty? I would like to see that.
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Old 01-04-2010, 10:32 PM   #19
bushwahkhan
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Quote:
Originally Posted by chazly413 View Post
You can leave the cat unless you really want to get rid of it. And engine work means like cams and perhaps some work to the engine internals and stuff.
I gotcha thanks for clearing that up for me......


Sorry im still learning I just want to make sure that when I spend money that im not missing anything or that im satisfied with what I got...

From what I read supposedly a full catback is better than a axelback with a custom shop midpipe?

Also how can I figure out if my heads are single or dual?
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Old 01-05-2010, 12:00 AM   #20
chazly413
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Quote:
Originally Posted by Subyroo2.5 View Post
So according to you if i put street cams in my car it wouldn't void my power train warranty? I would like to see that.
I've read it through my various travels around NASIOC but I don't feel like searching for a source right now.
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Old 01-05-2010, 12:14 AM   #21
bushwahkhan
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Originally Posted by chazly413 View Post
I've read it through my various travels around NASIOC but I don't feel like searching for a source right now.
huh???

***SIDE NOTE***
Will any catback exhaust that fits a N/A car 2000+ (or even earlier) fit my 09 2.5 n/a?
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Old 01-05-2010, 12:15 AM   #22
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Your heads are dual port
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Old 01-05-2010, 12:46 AM   #23
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Quote:
Originally Posted by RaceFaceXC View Post
Your heads are dual port
Quote:
Originally Posted by bushwahkhan View Post
huh???

***SIDE NOTE***
Will any catback exhaust that fits a N/A car 2000+ (or even earlier) fit my 09 2.5 n/a?


Thanks!

I was looking at this tsudo catback....

http://www.speed-element.com/servlet/Detail?no=284

anyone have this or know if it is any good? or any fitment problems with my 09 n/a

or is the Apexi catback that much better?
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Old 01-05-2010, 01:59 AM   #24
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As far as the warranty thing. . .Pulling your motor apart and replacing the cams will not Void your warranty. However, I'm rather confident that you'd be denied coverage if the motor blew at any time after that---unless you could prove to SOA's satisfaction that the motor did NOT blow because of hotter cams, etc. To give an example. . .if a window motor failed, they'd have to replace that regardless of engine modification. If the motor (and perhaps anything else in the driveline) failed, they could blame it on your engine work, and say that you pushed things beyond their design limits. It might just sound like semantics, but once things get all legal, semantics matter. As has been said before. . .you've got an '09, leave the powertrain alone, and have fun making it drive better.
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Old 01-05-2010, 09:53 AM   #25
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