Coz they are more sensitive than 00-05 s2k's.

 

So if you put a high flow cat on a 06 and up it needs an anti fouler reguardless? What code does it throw if you do not? I am very curious about this.....I have an 01 and I have to run an anti-fouler to keep the P0420 cat efficiency code from coding, and I understand why.... But when it comes to the sensitivity of the sensor....it measures oxygen content, thats it.....I have never heard of needing the fouler for a range or performance issue. Just curious

 

Weird how you have to run a defouler on your '01, because I'm running the Berk HFC on my '01 and I haven't had a code since I put it on 1.5k miles ago

 

Im running an Invidia Test Pipe, not a HFC...guess I should have stated that, sorry.

 

OK test pipe makes sense

 

So, as of Friday afternoon last week I am now running a Berk 70mm test pipe. Ohhhh yeahhhhh.

 

So my car rattles right at the test pipe.... I'm thinking same problem?

 

^^ well do you have a test pipe or a cat... a test pipe doesn't have the filament

 

Test pipe. I believe Berk 70mm

 

There is nothing inside to rattle. The bolts might have come loose.