I have a 2004 S4 6MT
Okay, so I've searched google, VWVortex, and Audi Forums for info on a DIY for piggies for the B6 model s4. I know how to remove the downpipes (found that thread)
And I figured out a fast way to get the precat removed once I have the dp removed.
So I can remove the DPs and I can gut the precats. But from there, I'm just no connecting the dot with the CEL and the O2 sensors. I understand that there are 4 O2 sensors? 2 after the precats and 2 after the main cats? Do I simply buy a set of spark plug defoulers and put them into the openings for the precat O2 sensors? Do I have to move them closer to the main cats AND space them?? Should I get the VAST spacers instead?
I've read that you sometimes will get a CEL anyway, even if you space the O2 sensors.
If I go to the trouble of pulling my DPs and gutting them, what do I need to do to the sensors to avoid a CEL?