well i just deleted my cat and res. with a custom straight through pipe finishing with the hks legamax premium muffler and about three days after that i now have a constant check engine light.... i didnt get delete the 02 sensor on the cat as i got it tapped roughly back on the original location.... Has anyone else come along this problem with either the same situation or Test pipe???? Any thoughts of this would help.....

 

p0420 most likley, the cat code, you need to get an oxygen sensor spacer, it will take some of the sensor out of the flow of exhaust and get rid of the light

 

the shop that did my exhust had thought that when intalling the exhust and place the 02 sensor further out of the flow.......

 

Touge Motorsports has an angled non fouler. I did the same as you and it turned the check engine light off with the install of the non fouler. $20 847 290 1531. Had a great experience with these guys. http://shop.tougefactory.com

 

i just purchased a 02 simulator/fouler 29.99cdn tohoefully clear the code...... loving the new power and throttle repsonse......

 

good luck man hope it works for you.