Heres what could be inside:

Several resistors connected to the switches to cause the computer to read a colder air temp than actual.

This will cause an increase in ignition timing up until the knock sensor reads knock.

Most of you are dedicated to low octane garbage gas, and already banging on the knock sensor. Thats why your VX gets better mileage initially after you reset the ecu. The knock count isn't yet high enough to pull timing.

John C.