Neat way to get rid of CEL form test pipes

Hello all

I recently added test pipes to my 360 and of coures the CEL came on .
I was searching the internet to find a soloution but didnt like the idea of wiring a
simulator into my 02 sensors . I found these little spacers that go between teh o2 sensor and teh pipe , They space the sensor out about 1.5 inches .
Well I figured for 20 bucks what the hell , Well hell they work , No more check engine light . Ill post the link to the company that sold them , I cant find them on my computer at home .

 

Do you use the spacers for both the pre-cat and post cat O2 sensors?

 

Its on the second one not the primary one .