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Old 01-28-2013, 09:40 PM   #1
Bluewrx06
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Default Down pipe question, please help!!!

Can some tell me what this hole is for on my catless down pipe??? It has threads on the inside like something screws into it?



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Old 01-28-2013, 09:44 PM   #2
JAMM0N
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ever thought of the o2 bung?
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Old 01-28-2013, 09:48 PM   #3
WRXSteye20008
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I would also venture and say the O2 sensor bung as well. Rather creative design since it is spaced enough to give a false reading to the ECU allowing you to run catless without throwing a code. Much like having a spark plug defouler.
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Old 01-28-2013, 09:48 PM   #4
Dmochowski
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yeah since its catless it screws into that tube on the downpipe so it wont throw a cel
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Old 01-28-2013, 09:55 PM   #5
Bluewrx06
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My first thought is that it was an 02 bung but I'd never seen one that had a tube coming from it.
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Old 01-28-2013, 09:58 PM   #6
Bluewrx06
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So I wonder if its just made for a bung plug or an actual sensor?
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Old 01-28-2013, 10:20 PM   #7
HinshawWRX
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Actual sensor. The secondary is used MAINLY for cat efficiency.

What brand dp is that?
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Old 01-29-2013, 10:23 AM   #8
Bluewrx06
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To tell you the truth I have no idea. It doesn't have a name stamped anywhere on it, and I can't find one that looks like it on the Internet.
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Old 01-29-2013, 12:28 PM   #9
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Rear o2 sensor bung.
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Old 01-29-2013, 12:32 PM   #10
Omega_2nr
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^Yep. As was said many times before, Rear o2 sensor bung with a "built-in" CEL-fix for a catless DP.

I remember Downpipes being offered back in the day with a built-in CEL fix.....was Helix one of those?
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Old 01-30-2013, 09:52 AM   #11
fritzski
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i have done some research on the rear o2 sensor, like hinshawwrx said, the rear o2 is mainly for cat efficiency. however the rear sensor does have the ability to change fueling to some degree (on the gr). i havent been able to find out when subaru started this, but i have read some threads where people were making the mechanical fix on their own with spark plug anti foulers and had some fuel issues afterward. i would keep a close eye on fuel trims for awhile just to make sure no issues arise.
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Old 01-30-2013, 01:07 PM   #12
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are you wearing uggs......... dude noo.......
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Old 01-31-2013, 07:19 AM   #13
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Interesting design. Wouldnt u run the risk of burning the wire off the o2?
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Old 01-31-2013, 10:54 AM   #14
fritzski
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Quote:
Originally Posted by Varady360 View Post
are you wearing uggs......... dude noo.......
but they're so comfy!
no, seriously the rear o2 is a/f 3 and it most definitely has the ability to alter fuel trims
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Old 01-31-2013, 11:24 AM   #15
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is it threaded on the inside? If not, could be a custom V-Band for an EWG re-plumb.
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Old 02-08-2013, 12:08 AM   #16
Bluewrx06
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Quote:
Originally Posted by Varady360 View Post
are you wearing uggs......... dude noo.......
Hahaha hell no bro, that's my girl holding it while I snap the pic.
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Old 02-08-2013, 10:58 AM   #17
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Quote:
Originally Posted by Varady360 View Post
are you wearing uggs......... dude noo.......
I was thinkin' the same ****!
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