AzMotorhead

IF I order a catless X pipe
Why in THE HELL would I need 2 downstream bungs for O2 sensors????
Now I have to try and find 2, 18mm x whatever thread plugs.
This kind of stuff irritates the hell out of me.

FNBADAZ06

LOL...just went thru the same thing, Phil. I got them locally at Orielly Auto parts
M18x1.5 O2 Sensor Plug.

farmington

Kenny94945

Perhaps for an air/ fuel gauge sensor.
Exhaust temp sensor?
Holes exist to make your exhaust sound more like a race car (joke).

Garymorris

The more options for 02/wideband placement the better. You could throw an old 02 sensor in there if finding a plug is such a problem.

AzMotorhead

Thanks for all the reply's guys. I did find some plugs in my box of scrounge.
ARH x pipe comes with a provision(Plugged bung) at the x for a wideband.
Car I'm building is a track car

BlindSpot

I know I'm late to this party. Any parts store will carry an 18mm x 1.5 oil pan drain plug (replacement plug). I've used these and they work just as well. Purchased them at O'Reilly Auto Parts. Find them where the oil/oil filters are stocked.