Thanks for the great feedback. I'll have the same setup minus the Corsa here soon. Might be wrong, but I'm guessing your exhaust may indeed be contributing as you noted. We'll see if a drone manifests or not with a stock exhaust setup.Hehe, ya the air that time of year is pretty great.
Overall I've been pretty pleased with the setup including the Corsa. The increase in responsiveness is noticeable, and the truck makes incredible noises with spirted driving. The effect is not lost on me months later.
If I had one complaint, it's that the K&N is right on the edge of being too noisy for daily driving (though not sure if this is compounded with the exhaust and pulley).
Under any sort of load at highway speed the blower will drone, and if you're bucking a headwind at 120kpm / 75mph the drone is persistent and noticeable in the cab.
It's manageable, but RIGHT on the line of being too much.
I don't put on many highway miles, but if I did would likely swap out to an S&B or something a little tamer and hard to imagine I'd notice any performance difference.
Hope that helps!
K&N definitely seems to have the most purely performance oriented design that's for sure. Even AFE partially replicated it now, and the S&B as well if you remove the lid. (All those ones need now is the direct filter location air channel that K&N's new upper scoop provides).

