Will adding a K&N be advisable on my stock 2001 Impreza WRX STI
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This is a discussion on Will adding a K&N be advisable on my stock 2001 Impreza WRX STI within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have read a few posts on BOV and Cold air intakes. I see it is not advisable to add ...

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    Question Will adding a K&N be advisable on my stock 2001 Impreza WRX STI

    I have read a few posts on BOV and Cold air intakes. I see it is not advisable to add a BOV on a stock 2001 impreza wrx sti but better a cold air intake which will give that "phsshhh" sound.

    However if I add a K&N apollo air intake will i need to make any other mods to the car as it will increase the amount of airflow. Or automatically does the car adjust how much fuel to air ratio required after I install the apollo intake.

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    The Guy On The Couch TownLine500's Avatar
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    Personally I like the Cobb intake.
    If your planing other mods the SF intake and a Cobb V3 tuner, it's a great place to start.
    Most intakes require some kind of adjustment for MAF scaling. All the newer ones require a tune.
    I believe tuning is not required on an 01. But somebody correct me if I am wrong.

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    You don't need a tune for an intake. Its recommended for any mod to get a tune but its not needed for the car to work unlike a dp or a bigger turbo. Don't get a bov get a better bpv. A bov will screw up ur afr and these cars come with a bpv stock so it will run better. Over time the car will learn from adding the intake. If you are really worried just pop off the negative terminal and install ur intake then put ur terminal back on wait for the car to warm up completely then enjoy. But definitely get an accessport mod I've gotten. Second would be Accesstuner

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    Quote Originally Posted by TownLine500 View Post
    Personally I like the Cobb intake.
    If your planing other mods the SF intake and a Cobb V3 tuner, it's a great place to start.
    Most intakes require some kind of adjustment for MAF scaling. All the newer ones require a tune.
    I believe tuning is not required on an 01. But somebody correct me if I am wrong.
    Thanks..will try out the COBB SF intake for starters.

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    Quote Originally Posted by CCastro23WRX View Post
    You don't need a tune for an intake. Its recommended for any mod to get a tune but its not needed for the car to work unlike a dp or a bigger turbo. Don't get a bov get a better bpv. A bov will screw up ur afr and these cars come with a bpv stock so it will run better. Over time the car will learn from adding the intake. If you are really worried just pop off the negative terminal and install ur intake then put ur terminal back on wait for the car to warm up completely then enjoy. But definitely get an accessport mod I've gotten. Second would be Accesstuner
    This is very helpful. Will get a better BPV and add an SF intake for starters and then proceed to getting an accessport mod. Will keep you posted incase i have any challenges. Thanks
    Last edited by tuka16; 09-27-2014 at 03:10 AM. Reason: Missed a word

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    Registered User nsibanez's Avatar
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    The accessport might also be good with everything so you can data log as well. That's just the route I'm doing, I just want to make sure high mileage and boost doesn't hurt too much
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    Apart from a COBB BPV would anyone have recommendations on a good or better BPV. And Air Intake.

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    Quote Originally Posted by tuka16 View Post
    Apart from a COBB BPV would anyone have recommendations on a good or better BPV. And Air Intake.
    I love the Kompact BPV from Turbosmart. It holds boost awesomely doesn't break the bank and sounds great when it recirculates. Intakes....im running the Injen cai and I love it .a lot of people don't like it because where the maf sensor it tends to throws off the air/fuel ratio a bit but I tune my own car so I know how to fix it. It depends on your goal for power wise honestly if you are shooting for over 300whp get a cai(aem, injen, cosworth all make great ones) if staying there and under get the cobb sf or stay stock. Oh and btw aem and injen are both CARB approved just in case you live somewhere they might hassle you for it

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    Quote Originally Posted by tuka16 View Post
    Apart from a COBB BPV would anyone have recommendations on a good or better BPV. And Air Intake.
    And since you will be getting a new bpv. When you do, you should upgrade ur throttle body hose (Mishimoto makes a great one). The stock one from Subaru ends up warping bad after running more boost and leaks.

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    Quote Originally Posted by CCastro23WRX View Post
    And since you will be getting a new bpv. When you do, you should upgrade ur throttle body hose (Mishimoto makes a great one). The stock one from Subaru ends up warping bad after running more boost and leaks.
    Mishimoto is great. Fitment was weird but you figure it out. I still don't know the best way to have the t bolt clamps though

    On top of that the stock hose either slips off, the inner flap comes undone, or it tears...and doesn't require high boost to do that either. It'll do it at stock levels
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    OMG WTF MainFrame's Avatar
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    Come on guys.. most intakes should be tuned for (although it might not kill his engine on the 01 like it would on an 08+). And they don't make Access Ports for his car. Access Port is a USDM thing, and they didn't sell the STi in the US until 2004. He may have trouble finding someone to tune his car, in which case I STRONGLY advise keeping it stock.

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    Quote Originally Posted by MainFrame View Post
    Come on guys.. most intakes should be tuned for (although it might not kill his engine on the 01 like it would on an 08+). And they don't make Access Ports for his car. Access Port is a USDM thing, and they didn't sell the STi in the US until 2004. He may have trouble finding someone to tune his car, in which case I STRONGLY advise keeping it stock.

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    If access ports were not made for 01 sti's what basic mods can i limit the car to without messing the car up.

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    OMG WTF MainFrame's Avatar
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    There are a lot of other ways to tune a car than just using an AP.. but you never said what market your car is made for, or where you live. I have helped a few Australians out with tuning in the past, but unless they live in Sydney, it usually means a super long drive (Perth to Sydney is a 42 hour drive).


    If you don't have local access to a professional Subaru tuner, you may still be able to get an e-tune done using Open Source.. if you can get your hands on the right cable. I think RomRaider should have definitions for UK, AUS, EDM, and JDM bugeyes, so there's still hope.



    If you just want to know what mods you can do without having to tune for them, basically nothing performance wise. You can do plenty of suspension/brake mods though. A good set of springs and struts, with new top hats, and some aftermarket swaybars with new endlinks would make a vast improvement to handling. And considering the age of the car, it wouldn't be a bad idea to replace every single bushing you can get your hands on.

    You could probably get away with running a good aftermarket intake (not K&N), IF your ECU functions the same as the 2002 USDM model.. but without tuning the car would only lose power and not run as well as it would with the stock intake.

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    Quote Originally Posted by MainFrame View Post
    There are a lot of other ways to tune a car than just using an AP.. but you never said what market your car is made for, or where you live. I have helped a few Australians out with tuning in the past, but unless they live in Sydney, it usually means a super long drive (Perth to Sydney is a 42 hour drive).


    If you don't have local access to a professional Subaru tuner, you may still be able to get an e-tune done using Open Source.. if you can get your hands on the right cable. I think RomRaider should have definitions for UK, AUS, EDM, and JDM bugeyes, so there's still hope.



    If you just want to know what mods you can do without having to tune for them, basically nothing performance wise. You can do plenty of suspension/brake mods though. A good set of springs and struts, with new top hats, and some aftermarket swaybars with new endlinks would make a vast improvement to handling. And considering the age of the car, it wouldn't be a bad idea to replace every single bushing you can get your hands on.

    You could probably get away with running a good aftermarket intake (not K&N), IF your ECU functions the same as the 2002 USDM model.. but without tuning the car would only lose power and not run as well as it would with the stock intake.
    My car is basically a JDM bugeye and definitely have issues finding a professional tuner in Zambia,southern africa. Not sure how the open source works but if it can get more power out of the car then it works for me. Maybe South africa/Namibia might have good tuners but way to far to get. We have professional tuners here specialised in building rally spec sti's etc but am more into it on the road at its best.

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