non fouler?

[greyturbo]

so i went to auto zone today to check out the non foulers for a test pipe i have two questions, which once should i get as i seen two sets of 18mm ones ,the one was a little bit shorter on the thread side,should i get the longer or shorter one, question two is what exactly do i drill out just make the inside bigger and how much bigger did you guys go?

[n7plus1]

get 2 smaller ones, and drill 1 out to 1/2".....so it goes testpipe>bung>plain non fouler>drilled out fouler>o2 sensor

[greyturbo]

so for one sensor i need two foulers put together?

[ridelikeme]

so for one sensor i need two foulers put together?

yeah thats correct... it did not work for me though, CEL came back... im gonna try throwing on a third

[jessefrank]

I'm running 2 anti-foulers on mine with no problems; one long and one short.
I bought a pack of each (2 short & 2 long).
When I drilled mine out a 1/2" bit wasn't big enough. I belive a 19/32nds bit is the magic one, although I just honed the hole out with a old 1/2" bit since I didin't have anything over 1/2" avalaible. The wall gets really thin on the drilled anit-fouler. I'm glad I got 4 as 1 I drilled through the side wall and the other snapped in half when I was tightening it into the TP.

[greyturbo]

would it help if i drill both out or just the 2nd one?

[n7plus1]

just 1...not only does this help fit the sensor, i believe it helps tricks the sensor in its readings.

[greyturbo]

alright good info thanks for the help everyone i'll update when i get it done and let you guys know if it worked...again thanks alot