Stage 2 on 2004 WRX - Page 3
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This is a discussion on Stage 2 on 2004 WRX within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Sure thing dude. If you need anything else. Let me know!...

  1. #31
    UnBanned Sinister's Avatar
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    Sure thing dude. If you need anything else. Let me know!
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  3. #32
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    +1 on the grimmspeed uppipe. im in chester county PA and the inspection stations around here dont care and dont even really do visual inspections so i wouldnt worry about the aftermarket downpipe (catted or catless). just make sure your CEL is off and it should be fine. theyve never done the sniffer test on me just plugged the scanner in the obd2 port and thats it. but i also go to "special" inspection/emission shops lol
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  4. #33
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    Does the grimspeed pipe have the bung welded in for the O2?


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  5. #34
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    Quote Originally Posted by Jake2004 View Post
    Does the grimspeed pipe have the bung welded in for the O2?


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    There is no O2 sensor in the UP. The sensor in the UP is the EGT sensor, which becomes useless after eliminating the catalyst in the pipe. It is best to remove the sensor and perform the 2.2kOhm resistor mod.
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  6. #35
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    Isn't that temp sensor important to the feedback to the ecu? It seems like tricking the ecu into reading the same temperature all the time would be bad for the engine.
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  7. #36
    zax
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    Quote Originally Posted by Jake2004 View Post
    Isn't that temp sensor important to the feedback to the ecu? It seems like tricking the ecu into reading the same temperature all the time would be bad for the engine.
    You're grasping at straws.

    It has NOTHING to do with any standard adaptive ECU functions. The EGT sensor merely monitors the health of the catalyst. No catalyst, no need for the EGT sensor.
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  8. #37
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    Just to confirm from a second person. Zax is correct. No EGT in the up pipe after 2005 because the pre-turbo cat was ditched. It was there for cold start emissions. They put a vacuum pump system in with the 06's to replace the pre-turbo cat. Basically they inject fresh air in the heads to dilute the AFR on cold start. Tricks the sniffer. It's ridiculous, but legal and still being used.
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  9. #38
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    Some up pipes have the bung for the EGT from what I have seen. Is there any harm in leaving it in there? I know with the AP you can monitor that temp. I am all about gauges and I think it would be nice to see what I am running temp wise. Thoughts?
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  10. #39
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    Quote Originally Posted by Jake2004 View Post
    Some up pipes have the bung for the EGT from what I have seen. Is there any harm in leaving it in there?
    Yes, actually. Leaving the EGT sensor inside the pipe provides more ammo to bombard the turbo. When you remove the EGT sensor, you'll see just why I say this: the EGT sensor is a long filament. For this reason, nearly all reputable uppipes do not have a bung for the EGT sensor.

    Quote Originally Posted by Jake2004 View Post
    I know with the AP you can monitor that temp. I am all about gauges and I think it would be nice to see what I am running temp wise. Thoughts?
    If you want flashy lights dancing around on your gauge pod, by all means keep the EGT in the uppipe. For all intents and purposes, the EGT sensor in that location is useless except to monitor the catalyst efficiency for what the sensor was intended. The proper location to reap the usefulness of the sensor is to place the EGT probe in the header, usually on the collector for Cylinders 2 and 4. Since this location is considerably upstream from the stock EGT probe location, and since the stock sensor isn't very accurate, nearly all serious enthusiasts find the benefits of removing the sensor to far outweigh the benefits of leaving the sensor in the bung.
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  11. #40
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    Yup. That.

    EGTs in the up pipe are a lot cooler than in the manifold / collector
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  12. #41
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    Thanks guys, I appreciate all the help!
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