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In case anyone cares, 21 STI with GESi DP and intake. Got tuned just the DP in March, no issues. Got tuned in May with DP and intake, P0420 code. Asked Botti who is my tuner and he replied with he could fix the code potentially with o2 scaling.

Just FYI incase anyone wanted a GESi DP if you can find it that with the green update, still can tune it seems. Will get more miles, but I wasn't able to get over 35 miles before throwing a code, and pending was pretty much right away. On the 2nd revision and it appears to be ok so far.

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He is the man!
 

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I had mine tuned the morning after the bomb drop, not knowing it was happening of course with no tgv's and air pump deleted... just to find out i had to put everything back on. The guys at National Speed managed to get a great tune even with my car in "limp" mode. but long story short even after putting that crap back on and running a GESI DP never had a code for it
 

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Bump, a guy in my local community had a cat CEL on his 19’.
He tried spacers and o2 cats to no avail.
Then I mentioned the o2 scaling and he reported back that the CEL has not returned since his tuner applied this revision!
This verywell looks like the answer!
 
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