Ok this is the thing. I bought the 06 WRX TR last September. I call Injen so they can use the car to make a new CAI and Up and downpipe for the car. So everything is mounted and the car is running cool. But, when I am cruising down the freeway out of nowhere CEL pops and the code says the car is running lean. Should I put the stock box back on or what do you guys recommend? :confused:

Engine management is a must, Access Port etc.....

reset the ECU, let it relearn, it should be fine.

ive done that several times already. The AccessPort says not to use with any other CAI other than COBB. Does it really matter?

I use my injen intake with Cobb stage 2 and it runs fine (a little leaner but still safe). Intake and no EM is very dangrous!

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Ok this is the thing. I bought the 06 WRX TR last September. I call Injen so they can use the car to make a new CAI and Up and downpipe for the car. So everything is mounted and the car is running cool. But, when I am cruising down the freeway out of nowhere CEL pops and the code says the car is running lean. Should I put the stock box back on or what do you guys recommend? :confused:


....we recommend that ya don't just throw(junk) parts at yer car and see what blows it up, after the fact.

Do not give in to the stupidity of instant gratification.....research, read, learn---THEN DO/buy.

I use my injen intake with Cobb stage 2 and it runs fine (a little leaner but still safe). Intake and no EM is very dangrous!


Running ANYTHING---say that again---ANYTHING that is not SPECIFICALLY RECOMMENDED BY COBB with AP is BAD JUJU....do NOT do this!!!!!!!

It may cost ya an engine.

So I should just put back on my stock back on

So I should just put back on my stock back on

^^^What Uncle Scotty said above...read Cobbs recommendation and follow it...or get a Protune...

If you are throwing CEL's with a lean condition using the Cobb AP...I would take it off.

If you like your AP like myself, and absolutely need to have this intake on your car, take it to your nearest tune shop and get a protune to compensate for the intake...

Being in Hawaii, we don't have access to a Dyno...so I had to request special Protune maps be created for my 04 STi to compensate for my Header/APS tbe combo...from PDXTuning...

All I can say is WOW! I am really happy with my new maps...I didn't know I lost low end with the header until I received the new maps...my car now pulls hard from start to finish with no hesitations...and my boost is more consistent and predictable...exhaust flow and sound are now smoother...I will be taking a few datalogs and sending Tim the results to see if he needs to tweak it any further...

I can't believe how quick my boost develops now...in third gear when I punch it, by ~3200rpm's(+ or -) I'm hitting close if not max boost...I should hook it up to my AP to get a more accurate reading...my DEFI BF gauge reads in Bars and after it passes the 1.5 Bar I can't see where it stops...I have to slow down...

My friend here also received his maps for his 04 Sti tuned for his Injen CAI and TurboXS Stealthback/Blits Nur Spec R axle back...His works great as well...he called me up last night to tell me pretty much the same as I wrote above...

This is my first real tune and I am definitely a believer!

^^^What Uncle Scotty said above...read Cobbs recommendation and follow it...or get a Protune...

If you are throwing CEL's with a lean condition using the Cobb AP...I would take it off.

If you like your AP like myself, and absolutely need to have this intake on your car, take it to your nearest tune shop and get a protune to compensate for the intake...

Being in Hawaii, we don't have access to a Dyno...so I had to request special Protune maps be created for my 04 STi to compensate for my Header/APS tbe combo...from PDXTuning...

All I can say is WOW! I am really happy with my new maps...I didn't know I lost low end with the header until I received the new maps...my car now pulls hard from start to finish with no hesitations...and my boost is more consistent and predictable...exhaust flow and sound are now smoother...I will be taking a few datalogs and sending Tim the results to see if he needs to tweak it any further...

I can't believe how quick my boost develops now...in third gear when I punch it, by ~3200rpm's(+ or -) I'm hitting close if not max boost...I should hook it up to my AP to get a more accurate reading...my DEFI BF gauge reads in Bars and after it passes the 1.5 Bar I can't see where it stops...I have to slow down...

My friend here also received his maps for his 04 Sti tuned for his Injen CAI and TurboXS Stealthback/Blits Nur Spec R axle back...His works great as well...he called me up last night to tell me pretty much the same as I wrote above...

This is my first real tune and I am definitely a believer!

I dont have the AP yet. I am just running a Injen CAI and am throeing a CEL. I was reading the COBB Stage 2 Map Notes and it says to use the COBB SF Intake. Now, do they just say that to sell their product or can I keep my Injen CAI with the AP?

Most intakes (this is not specific to Injen) use a larger than stock tube, and this throws the MAF sensor out of calibration. It causes the MAF to report a lower intake flow, which in turn the ECU interperets as lower volume of intake air. It thus adds less fuel, causing the mixture to run lean.

The ECU cannot always learn this behavior because, due to the bends of the intake, it will run more or less lean depending on flow. The stock intake has the MAF immediately after a filter and velocity stack to avoid this issue. Aftermarket intakes do not.

In conclusion: most aftermarket intakes are bad news.

I do really like what Custom Performance Engineering does (http://www.cp-e.com). They sell much larger diameter intake kits with a custom chip that recalibrates your MAF to that diameter. You alleviate the restriction at the MAF without throwing your fuel trims off. It's a great pairing of parts.

on what parts they use to tune it with...in the case of the Stage 2 maps...generic tbe, stock or apparently Cobb short ram intake, and stock bypass valve.

If you stray away from this configuration, you run the risk of damaging your engine due to using parts not tuned for their maps...

So, i would say yes, that Cobb would like to sell their products and will use their products when they write their AP maps...and would not assume that the Injen CAI has the same airflow characteristics as the Cobb...I don't think I would feel comfortable running the Injen intake without getting a custom Protune for the AP...

I dont have the AP yet. I am just running a Injen CAI and am throeing a CEL. I was reading the COBB Stage 2 Map Notes and it says to use the COBB SF Intake. Now, do they just say that to sell their product or can I keep my Injen CAI with the AP?

If your car is throwing a CEL now without AP dont run it with AP. Some intakes are ok with the Cobb AP and will not run rich or lean. They can't tell you that though because all intakes are not created equal and they have no clue what you are going to use. Some users have intakes and run AP stage 2 maps fine with out a single CEL ever. Since you do get a CEL now with no EM the car does not like the intake and just a AP will not help that. A protune will.

You dont have to throw a cel to run lean, many people run lean without getting said cel.

Cobb designed thier intake to not need a tune, thats one reason it is supported.

I do really like what Custom Performance Engineering does (http://www.cp-e.com). They sell much larger diameter intake kits with a custom chip that recalibrates your MAF to that diameter. You alleviate the restriction at the MAF without throwing your fuel trims off. It's a great pairing of parts.

I would stay soooooo far away from that :lol:

If your car is throwing a CEL now without AP dont run it with AP. Some intakes are ok with the Cobb AP and will not run rich or lean. They can't tell you that though because all intakes are not created equal and they have no clue what you are going to use. Some users have intakes and run AP stage 2 maps fine with out a single CEL ever. Since you do get a CEL now with no EM the car does not like the intake and just a AP will not help that. A protune will.

I think putting any intake on a stock 06 wrx could throw a check engine light. Stock AFR where pretty high especially at the cross over. With stage 2 and Injen intake I had AFRs around 14.5 at idle and at WOT 11.1 or so. No lean or rixh patches. What I was wondering is xtreme_hack mentioned an up-pipe and down pipe. Are those on the car? I would assume those would cause a lean issue? Also, has anyone done an up-pipe on an 06? The loss of the air pump could cause something. What is the exact number for the check engine light?

I would stay soooooo far away from that :lol:
Good for you! You're not going to explain why? A combination of other products (and dyno time) would accomplish the same thing, but for a much higher price.

I've used their product on another car with great results. In fact, darn near every Mazda6 owner has one of these things. It was THE mod to have, and to this day it is the only intake for the car that wouldn't throw a CEL. With the much bigger intake tube, the MAF will read a lower voltage at a given flow. The MAF customizer box corrects this; it's got a "MAF translation map" (for lack of a better term) that has been calibrated on a flow-bench. The resulting fuel trims are zero, despite the huge intake pipe.

Granted, this is a totally unnecessary product if you've already got a UTEC or similar device (something we didn't have in the Mazda6 camp), but those things cost a bit more. For someone skipping on the more advanced engine management systems, this is the most economical way (that I'm aware of) to run a big intake, alleviate the restriction at the MAF, and still keep the fuel trims pegged at zero throughout the entire rev range. That the box lets you richen or lean the fuel trims (in a completely seperate tuning map) is a bonus and secondary.

I think putting any intake on a stock 06 wrx could throw a check engine light. Stock AFR where pretty high especially at the cross over. With stage 2 and Injen intake I had AFRs around 14.5 at idle and at WOT 11.1 or so. No lean or rixh patches. What I was wondering is xtreme_hack mentioned an up-pipe and down pipe. Are those on the car? I would assume those would cause a lean issue? Also, has anyone done an up-pipe on an 06? The loss of the air pump could cause something. What is the exact number for the check engine light?

I got the first CAI and Up & down pipe. Injen used my car for r&d. The code I get is P2096 – Post Catalyst Fuel Trim System Too Lean Bank 1

Go back to the stock intake. Just think, COBB an aftermarket company says ' use the stock intake", they could just screw with us and say buy their SS intake, but no they say use the stocker.
I even called them and explained my mods and the upcoming new turbo and they still said use the stocker. They have great Customer Support.
Take their advice and heed their warning.