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Old 11-25-2003, 01:28 AM   #51
WRXncrew
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You can use one pair of either 42002 (tapered) or 42009 (gasket style) and drill a 1/2" hole through one. Or, you can do what I did, and combine them using the 42009 as the base (drill a 1/2" hole through the 42002) and make 2.
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Old 11-25-2003, 06:10 AM   #52
VetteVert
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As was said, as long as you drill to 1/2" or more, you should be OK. You could try leaving the hole at the bottom of the bottom if you wish. I just drilled them both out and I'm still going strong.

VV
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Old 11-25-2003, 07:19 AM   #53
TheMadScientist
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I just made one last night. This is going on a TXS turbo back with 1 cat. What a great mod if it works.
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Old 11-25-2003, 07:32 AM   #54
VetteVert
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I would have thought you might get away with nothing since you actually have a cat (I have 0). Either way, should work for you, but post if it doesn't. I think all the results so far have been on Helix or equivalent downpipes that take the place of the DP and MP in one piece.

VV

Quote:
Originally posted by TheMadScientist
I just made one last night. This is going on a TXS turbo back with 1 cat. What a great mod if it works.
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Old 11-25-2003, 07:36 AM   #55
TheMadScientist
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Quote:
Originally posted by VetteVert
I would have thought you might get away with nothing since you actually have a cat (I have 0). Either way, should work for you, but post if it doesn't. I think all the results so far have been on Helix or equivalent downpipes that take the place of the DP and MP in one piece.

VV
If you just do the turbo back with one cat you can get away with no fix. On three cars that were fine with just the turbo back as soon as an uppipe was installed they started throwing P0420.
I hope this works if they do then I will be building alot more of them.
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Old 11-25-2003, 07:53 AM   #56
TopKatz
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UPDATE:

I had a bung extendor fabed up for my 04. Im runing STI up and scooby sport down, stock 3rd cat.

We put the extendor in the 3rd cat. The stock cat is a bad shape for an elbow type extendor. In fact its so bad that it causes problems. My extendor was hitting the cros member, and eventualy broke the female end of the cat! It created an exhasut leak.

I pulled the extendor, welded the femal bung back to the cat, and put the sensor back into the 3rd cat in its stock config. I did this on Fri and I have not goten a CEL yet.

Im not sure if its goign to come back on or not....

so, STI up, scooby down, stock 3rd cat...no CEL.... I have some highway miles on it...so Im not sure if it will come back or not...
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Old 11-25-2003, 09:15 AM   #57
s_nold
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I have put at least 1000 miles on my car since I first did the mod, and I have yet to get a CEL...so I am happy.

I have a MRT downpipe and a gutted up-pipe....for those who care.
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Old 11-25-2003, 09:38 AM   #58
VetteVert
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No cats at all, and 2000 miles...no CEL.

Topkatz...it must be something to do with your stock third cat....possibly the angle, but I'd bet it is the backpressure created from the cat....which forces more air into the extension than those of us without cats are seeing.

VV
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Old 11-27-2003, 02:05 AM   #59
speedblind
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Just put this on tonight. About 20 minutes from start to finish, and possibly the best five bucks I've ever spent on the car. Got a long trip down to Tucson and back this weekend, so the car will see plenty of highway cruising. Thanks to VV and everybody else that posted the plug nonfouler specifics! I'm much happier with this solution vs. cutting the O2 sensor wires!

Of course, I'll update this thread when/if I get a CEL like everybody else. Somebody should get this mod onto scoobymods.com. VV?
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Old 12-01-2003, 03:50 PM   #60
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bump.
topkatz. im going to be running the same dp as you. so you're saying that the stock 3rd cat is bad for the elbow, but do you know whether or not the spark plug thing will be fine?
any cel's yet?
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Old 01-03-2004, 10:29 PM   #61
hatchy
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Anyone know if this fix will shorten the life of the O2 sensor or the O2 controller? O2 sensors operate at a certain temp, and if take the O2 out of the exhaust stream, the O2 controller will probably trigger the heater element, and they are probably not designed to run continously.
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Old 01-04-2004, 08:54 AM   #62
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ScoobyBoy - Im curently running with no eliminator at all, and no cel.
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Old 01-04-2004, 04:42 PM   #63
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Quote:
Originally posted by hatchy
Anyone know if this fix will shorten the life of the O2 sensor or the O2 controller? O2 sensors operate at a certain temp, and if take the O2 out of the exhaust stream, the O2 controller will probably trigger the heater element, and they are probably not designed to run continously.
i don't think so, if the sensor read anything out of the ordinary then it would throw a cel. exhaust gases are still reaching it.
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Old 01-04-2004, 05:39 PM   #64
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Some of the gas is reaching it, that is how this mod works, but I don't think there is enough gas to keep the sensor hot enough.
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Old 01-04-2004, 06:19 PM   #65
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you could just drill out a 1/2" hole in the base too then, that might help. Since we're all catless the exhaust gases naturally become hotter. taking the sensor out of the exhaust flow and diverting some gases to the sensor that way, enables the sensor read within the boundaries that is set by our ecu. If we left the sensor in the regular exhaust flow, it would throw a cel, and yes shorten the life of the sensor. with this mod it probably shortens the life still, but not as much as just leaving it in the regular exhaust flow, and we don't get a cel. All 02 sensors will eventually fail or start to give the wrong readings anyways, especially if you race or use gas additives and such, but then if you race you continually tune your car anyways
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Old 01-11-2004, 10:38 PM   #66
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FYI... I've been using my mechanical 02 Sensor modified bung extension CEL fix and have not gotten any new CEL after installing. It's already been several thousand miles and has been to the track and still no CEL. Don't spend $20 when you make the fix for $5 or $10 and requires NO SOLDERING or re-wiring.

Cheers and Enjoy
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Old 01-16-2004, 07:23 AM   #67
rex n effect
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CEL free for the last 2k miles after this fix.
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Old 01-16-2004, 12:18 PM   #68
02sedona
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I also have tried this fix with the 42002 kit from my local autozone. It does need to be drilled out for the o2 sensor to fit but i have rid my car of the check engine light. Thanks for the cheap tips guys
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Old 01-20-2004, 02:50 AM   #69
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This is a great idea! I had mine welded 1.4 years ago and still have not gotten a CEL.

http://forums.nasioc.com/forums/show...&highlight=cel
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Old 01-23-2004, 04:04 AM   #70
Macabre
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Still no CEL here..

Glad a non-weld solution was found!
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Old 02-01-2004, 11:16 AM   #71
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Quote:
Originally posted by s_nold
You only need one or the other...there is a small difference in them, I can't remember exactly what it was...they should be next to each other...and if I recall...it is somewhat obvious what the difference was from one to the other... Make sure you get two of either one...and you will have to drill out the center so that the O2 sensor will fit...The MINIMUM diameter of the hole should be NO LESS THAN 1/2" you will have to drill both peices out for everything to fit.
so you do have to drill a 1/2" hole in BOTH....? alryte about to try this trick very soon on my 04 STi
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Old 02-01-2004, 12:11 PM   #72
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Yes, and you're welcome
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Old 02-01-2004, 07:45 PM   #73
Macabre
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$15 is a good price for something like that - but this is the first I've heard of it. Do they have it on their website? I looked but couldn't find it. Do you have to buy an exhaust system from them to get it?
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Old 02-02-2004, 12:43 PM   #74
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I only drilled out one fitting, and my sensor fit just fine...
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Old 02-02-2004, 09:55 PM   #75
blaznasn
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Quote:
Originally posted by Prairie Dawg
I only drilled out one fitting, and my sensor fit just fine...
yeah just one atleast, so the sensor can fit in all the way, some people drill out the second, some don't, it works either way.
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