[*GT]

While I don't see anything wrong with this mod - I'v been running around with no honeycomb for as long as I'v owned my car with no problems whatsoever. I can see no reason why this would actually prevent the timing from being advanced. The correction of the AFC itself does NOT advance timing. The ECU retards timing as it see's a higher karmen value from the MAS(indicating a higher boost), so when you use a negative correction on the AFC, the ecu "thinks" there is less airflow, and the timing is advanced. If removing the honeycomb causes the car to run leaner, then it also reduces the karmen value that the ecu see's. This will advance the timing exactly the same as correcting with the AFC.