Hey, i dont know much about cars but i do know subaru engines are more confusing than the norm. I am trying to put a cold air intake on my subaru legacy. I bought a K&N apollo air filter but now im not sure if the i should remove the air filter already on the engine because i think the MAP sensor is attached to the stock filter. if i cant remove the current air filter then theres not much point in having two air filters so i'll send back the K&N apollo and just make some homemade cold air intake piping to replace the air box. just looking for advice on whether or not i can remove the stock filter and if everything will work out, thanks

You already have one. Follow the snorkus and you will see a true cold air intake by the hood.

ok, well thats kinda a bummer. my main objective in getting the CAI was to get rid of the stock airbox and hopefully get a few more HP and MPG. is there a way that this can still be done?

Is this a turbo car? If so, you'll probably do more harm than good.

 

Stock turbo airboxes are more than good enough for over 300 whp. Just get a good drop in filter and done.

 

If it's an NA car then go for it. You do have to reatin the maf sensor.

No its not a turbo car, but the sensor is really the only thing im worried about. im pretty sure the 2003 legacy has a MAP sensor, not a MAF. Either way i dont know what to do with the sensor with the CAI

the easiest way to get more out of your engine would be to remove all the emissions crap and use a different computer to run it. but since you can't do that and get your car to pass most? state inspections, you're stuck.

 

i'd be interested to know what the hp is on a jdm or european engine. same ? different?

 

i don't know what car looks like, but i have heard you will gain more from removing the roof rack than modifying the engine. of course that has not stopped folks from making changes they wanted to make.

Hey, i dont know much about cars but i do know subaru engines are more confusing than the norm. I am trying to put a cold air intake on my subaru legacy. I bought a K&N apollo air filter but now im not sure if the i should remove the air filter already on the engine because i think the MAP sensor is attached to the stock filter. if i cant remove the current air filter then theres not much point in having two air filters so i'll send back the K&N apollo and just make some homemade cold air intake piping to replace the air box. just looking for advice on whether or not i can remove the stock filter and if everything will work out, thanks

 

 

Also unless it goes into the front fender, it is no longer a CAI. It will be sucking in warm/hat air from under the hood. The stock set up takes air from outside the hood, has the ability to remove excess water (subarus have been known to forge streams sometimes).

Im planning on routing it to the hole in the right side of the fender right next to the wheel. I just need to know how to do this without screwing up the air temperature sensor thats attached to the stock filter. but i do want to remove the stock filter

Ok - you don't seem to understand.

 

1. You already have a CAI - All Subaru's do.

 

2. You will not gain any MPG or HP with your cone filter.

 

3. You WILL probably cause resonance issues, make more noise, and gain the ability to hydro-lock your engine.

 

The K&N filter you bought is entirely useless - it's a gimmick and you will only devalue the car and possibly cause great harm by installing it. Just return it and be happy that Subaru's are so well designed.

 

If you want more power you need to install a set of performance cams.

 

GD

Ok - you don't seem to understand.

 

1. You already have a CAI - All Subaru's do.

 

2. You will not gain any MPG or HP with your cone filter.

 

3. You WILL probably cause resonance issues, make more noise, and gain the ability to hydro-lock your engine.

 

The K&N filter you bought is entirely useless - it's a gimmick and you will only devalue the car and possibly cause great harm by installing it. Just return it and be happy that Subaru's are so well designed.

 

If you want more power you need to install a set of performance cams.

 

GD

 

 

What he said

The 2003 Legacy has a pressure sensor, and more importantly, a combination MAF/IAT sensor. Proper functioning of any MAF is dependent on air flow past it being relatively smooth. The factory intake is designed to accomplish that. By replacing it with something else, at various engine speeds you'll likely encounter resonance/turbulance/pulsation that will upset the MAF's ability to properly read the air flow. Even if you manage to gain something with your modification, there's a good chance that there will be a performance and/or drivability issue of some sort in exchange.

ok thanks for the advice guys. without y'all it sounds like i woulda totally wasted my time.