i have a gsr , stock computer(obd2) with v-afc wit skunk2 cams, carsound cat. 2.5, and a dunk exhaust... i need to get my car tuned but im getttin a code 67... (cat conv no performing well or something) anyway..if i reset the computer it goes away for about a week or two...does this mean my cat is clogged or bad?? could i reset it and tune it with the cat in there if it is clogged???... and now i just wana run a test pipe and put in a secondary o2 sensor faker... where could i get one of them?

 

ttt

 

nobody?

 

drive the car around and get out and look....if your cat is glowing red, it's clogged, or you might have damaged the sensor when pulling it out

 

does the car feel / drive the same? More than likely if you cat is CLOGGED you will notice it. I sure as hell noticed it when my first 2 carsound were clogged.

Sometimes it can break, and blow the packing out the exhaust. You would notice this, because the exhaust tone would be louder. (also happened to me.)

I also heard a bunch of rattling when mine broke.

Hope that helps a little,
-Will

 

When the honeycomb in my cat went out the performance in my car was hindered, also my gas mileage sucked. Once I had it replaced car was back to normal....