[Hardrock4445]

Ok guys, I had to make this up tonight so I decided to make a DIY for anyone that needs to make this. Will be needed to keep P0420 codes from vehicles with removed cats, and to prevent it from vehicles with a bad cat. ie: your winter beater with 175k that has a bad cat. You will need, 18mm spark plug non foulers X2 - available at any local parts store. 1/2" drill bit, a way to drill safely. Ok here we go

New spark plug non-foulers:


A way to drill:
[IMG]http://i797.photobucket.com/albums/yy258/hardrock4445/0***B854-DF28-420D-B809-D84447C70776-1845-00000231181E1D18_zps8ffa2ae0.jpg[/IMG]

Drill only one non-fouler:


Install drilled non-fouler onto oxygen sensor:



Install second non drilled non-fouler: (note, in this picture, I have the gasket on, do not use the gasket, you will get better results that way)



Install into catless header, you could also use this for vehicles throwing P0420 codes:


Hope this comes in handy for some people. You can buy spacers made specific to your application, but this is cheap, available at local auto stores and can be put together in less than 15 minutes if you have the tools.

I take no responsibility for your actions on your cars, or your safety if trying this DIY, please work safe and smart.