I have the same issue tried o2 extenders and still codes any ideas before i rip the down pipes off like i did with Corsa that would make me almost 4K in a hole .
Corsa had no drone what so ever my only problem with it was at high RPM it was extremely loud for my disable son that is very sensitive to noise don't know why he didn't have that problem wit Corsa on 09 Z06.
It started between 3700 and up and yes i did have a stock resonator on it and Kooks...
Have Corsa for sale PN14397GNM had it for 1 day it was too loud for my son had to take it down pm if anyone interested {Gunmetal tips paid $1600 for it }
I can confirm that Kooks will work with SPD Adapters,had them install last Friday the only problem is that you will need a tune without one you will get 420 450 code.
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