A catless DP would set codes and not pass emissions.
Right. So Socalhatch's report seems to throw cold water on the notion that IE stage 2 tune file doesn't disable that cat-efficiency 02 sensors (i.e., IE stage 2 is not a "test-pipe" file). Or at least, IE tune does not allow them to achieve readiness. Otherwise, it would have given him a CEL with a catless DP, correct?
It looks like the standard approach is necessary for IE tunes. Can someone confirm this is how I should do it:
1. Install DP, Enjoy stage 2 DSG pops and rolling V8s.
When time comes for my annual emissions check due next year (which is visual and OBDII only, but I believe in certain NC counties it requires ALL sensors to display ready).
1. Check OBDeleven for emission codes. If any sensors show incomplete or "not ready" (seems likely).
2. Flash back to stock (at least super easy for IE, at home).
3. Drive around, perhaps perform the standard "drive cycle." Hope that a turbo overboost CEL doesn't fire since running a stock tune with a high-flow cat.
4. After a day or two check OBD11 or other method to see if all sensors are "ready."
-- 4a. If all readiness doesn't set, put 02 spacer in, repeat 3 and 4.
5. If all ready, go get emissions tested and just hope they don't give flack about the IE label on the DP.
Right?
Sorry if I am derailing a smidgen. But this sort of thing is relevant for the OP topic review of the IE tune in a way.