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View Full Version : Need plug non fouler size

JoeScooby
07-05-2005, 08:47 AM
My test pipe comes in manana, anyone know what non fouler size to get for a Bosal 3rd/2nd cat delete pipe? I want to pick this ish up today...

OK any wrx owner know the size of the o2 sensor in the 3rd cat?
the mike
07-05-2005, 12:32 PM
I believe they are 18mm. Just go to PepBoys(or your parts store of choice) and look at the most common size.
A word of warning, you will need to drill them out to get the end of the 02 sensor in there. If I remember correctly, it is 1/2".

Also, get the flat faced ones, not the tapered seat ones. ;)
JoeScooby
07-05-2005, 12:57 PM
thanks, yah i knew the 1/2 portion but not the tapered thing. Now seeing how I need to drill it out, im assuming i need to thread it once im done? I need 2 of them right?
the mike
07-05-2005, 01:03 PM
No tapping required. All you are doing is making room in the middle for the tip of the 02 sensor. You could probably go a bit bigger than 1/2" too, I think I was getting "insufficient flow" codes in the EVO. Just don't go any bigger than the area the threads are in. It'll make sense once you have them in your hands.

You could also splice a resistor inti the feed wire of the 02 sensor. Just another option.
JoeScooby
07-05-2005, 02:14 PM
gotcha, thanks for the help!

woo no cats for me =X
the mike
07-05-2005, 03:24 PM
Me either as of yesterday!! :thumbup:
sfd
07-05-2005, 06:26 PM
how the heck do you guys pass emissions? Honestly, I'm seriously curious. I've heard horror stories from South jersey guys about minimal mods, let alone no cats.
the mike
07-05-2005, 07:55 PM
On an AWD vehicle they only run an OBD2 scan to see if the computer is reading OK. It has gotten easier since we can play with computers and such.
JoeScooby
07-06-2005, 06:54 AM
;)

Not having a AWD testing center is good in my book
JoeScooby
07-07-2005, 06:44 AM
mike, I couldnt find non taperd anywhere, so I just baught some 18mm non foulers. It looks like it makes a tight seal, is it really going to matter that much?
the mike
07-07-2005, 07:17 PM
It shouldn't as long as there is a crush washer in there.
JoeScooby
07-09-2005, 07:28 PM
so much for that job, All the bolts were rusted to hell. 4 bolts took me over 3 hours and 4 busted knuckles. Time to get pulled over.