Thanks, guys! It was my plan to make it look less like an "add-on", plus I got a bit lucky having the space in front of the intake to fit the sensor.
Stopped in to get some ethanol this morning to test the install since I had 91 octane (0% ethanol) in the tank. The tank was registering about 65-67% full, so I topped it up with "E85". The final blend according to the sensor was about 26-27% ethanol.
Quick calculations tell me that I got ~E77.7 out of the pump.
The fuel trims got pulled into spec pretty quickly, and the exhaust smell is greatly reduced. Interestingly it didn't clear up my transitional KR at low speeds, which tells me that I have some false KR to tune out (desensitizing the knock sensors(?)) thanks to the headers and solidish engine mounts. I have been scanning for Burst KR and haven't found a trace; so this about sums it up