[tfnaaf]

it restricts the amount of exhaust that gets to the second o2 sensor. This gives it a higher AFR reading. This simulates the cat doing its job when its not there

Originally Posted by v8eaterokv6

so what does this do exactly or how does it work

[texascivic2k1]

Originally Posted by nick95673

how does this work? It just picks up less emmission gasses since its further back?

That is exactly how it works... (Correct me if I am wrong)

Very GOOD Post!!!! I have done the same thing with mine. I have been threw two state inspections and has lasted a year and a half. I have that Megan Racing down pipe by the way. Great job!

texascivic2k1

[boricua_civic]

I bought a casper 02 sim from Hivtec a while back, he's from PR too, and it was cheap and the B!tch engine light is off

[4*banger]

Nice!!

[drunkenmagnum]

oh be sure to get the 18mm and not the 14mm. i accedently got the wrong ones the first time.

[5.0calypso93lx]

This works great, put it on when i installed a megan test pipe on my g/f's car last night, no cel. Sounds killer too.

[Kingnine]

This tip quite possibly saved my sanity. KUDOS!
Works great on my ebay special catless downpipe...!

[ncirom2003]

so now lets say i do this, could it potentially cause tuning issues because the ecu is reading incorrect data and adjusting a/f ratio off of it, or does the ecu only adjust a/f according to the first o2 sensor?
i think im gonna try it.

[tfnaaf]

Originally Posted by ncirom2003

so now lets say i do this, could it potentially cause tuning issues because the ecu is reading incorrect data and adjusting a/f ratio off of it, or does the ecu only adjust a/f according to the first o2 sensor?
i think im gonna try it.

The ecu only adjust AFR off of the first O2 sensor

[nighthawk1903]

I Have 3 02 Sensors so i use this on the 2nd one, before the cat, and the third one after the cat right????

[ncirom2003]

well then im going to make a quick trip to autozone and get these things! ill be very happy to not have cel's.

[skipbarber]

Originally Posted by nighthawk1903

I Have 3 02 Sensors so i use this on the 2nd one, before the cat, and the third one after the cat right????

you have 3?? stock? either way, you want to use it on the one after the cat only.

[nighthawk1903]

I have a HX with a EX header an testpipe conversion now my header has 2 02 sensors top an bottom.an my cat has one after, my stock manifold had a honeycomb like resonator on it i might get some pics if need be,an the cat had one, so i have 1 02 bypass in the testpipe check engine light (STILL ON)..... I didn't drill it out could this be why???? an what would happen if i put it on the lower 02 sensor ????????/

[tfnaaf]

Originally Posted by nighthawk1903

I have a HX with a EX header an testpipe conversion now my header has 2 02 sensors top an bottom.an my cat has one after, my stock manifold had a honeycomb like resonator on it i might get some pics if need be,an the cat had one, so i have 1 02 bypass in the testpipe check engine light (STILL ON)..... I didn't drill it out could this be why???? an what would happen if i put it on the lower 02 sensor ????????/

Im so confused by what your saying. .......This is how it should be.

First O2 sensor in manifold closest to the cyl head

Second O2 sensor further down pipe , past cat converter( if you have one )THIS IS THE ONE THE FOULERS SHOULD BE ON AND YES IT MUST BE DRILLED OUT OR THE O2 SENSOR WOUNT FIT IN IT!
Third O2 sensor......... Unless its a wideband i have NO idea what your talking about

[ncirom2003]

cant a shop do something while the cars being dyn0-tuned so that the cel will never come on for cat codes?