20 replies to this topic

[7 VII 7]

As the topic says how do you run a straight mid-pipe insted of a cat without throwing annoting CEL and getting dreaded boost cut?

I have heard about putting some space in the rear 02 so it doesnt get as clear a reading thus not being able to tell there is no cat.Anyone do this and have it work?

Any other ways ?

yes a rear O2 spacer will work

http://www.rallitek.com/rao2sesp.html

or spark plug fouler

DIY Fouler


damn I am good

[7 VII 7]

I heard you can use some washers to put pace on how far the 02 screws in so it doesnt get an accurate reading.

do what I posted

[Account_Deleted_T5M]

I run a straight pipe on my car with no CEL for Cat, other people have to run a spacer available from any auto parts store, it's called a spark plug spacer.

[FINN]

I just tied my rear o2 sensor to the frame, but wrapped the end in something i dont remember.  No CEL since summer.

[randomdude]

ive been running 2years no cat with ^mentioned spark plug spacer. no issues. mines a 95turbo FWIW

[FINN]

Yeah sorry I should add that I have a custom 3" turboback with no rear bung.

[Mesoam]

the correct way to do it would be having it deleted via a tune

[turbotuner]

too late for that.already have a tune.

Alter the tune!!!

[turbotuner]

Alter the 02 space is easier.

Fair enough! Can't argue with that

[lookforjoe]

Just get the spacer - washers won't move it far enough out of the exhaust stream - there's not that much thread on a O2..

I've "passed" NYS emissions, since there's no CEL (Only good for '96 -, in NY -95 are dyno'd - no cat =fail).

[gmsgltr]

Interesting... I was going to ask this too because the OBX dps are real cheap and If I dont have to throw in a cat right away I wont!

[Ian Carr]

Just picked up the "spark plug non foulers", not spark plug spacers. Advanced auto parts has them, they are 4$ for two of them (in the "Help" section). You need to drill one out with a 1/2" bit, I am trying to do it with just one that is drilled out half way. I will post up after I get it in and see if it works. From the sounds of it, it does work.

[lookforjoe]

You can see how deep the 02 spacer is in this pic...




..if it's not deep to move the sensor sufficiently out of the exhaust flow, it won't register a difference in 02 content, and the CEL will come back on...