i think all installation instructions start with 'disconnect battery'

 

When complete with spacer install, turn the ignition ON (battery still disconnected!) hold down the brake pedal for 30 seconds.
If you did not touch the throttle plate or disconnect the throttle body harness, that should be all you have to do.
Reconnect battery and you are good to go!

 

It specifically states in the Motordyne instructions that YOU DO NOT have to reset the ECU if you installed it properly!!! The only reason you might need to reset it is if you happened to mess with the butterfly in the throttle body. Then you would need to do a throttle position ECU reset.

With that being said, I didn't reset my ECU either.

I installed the spacer this weekend, along with the Stillen Z-Tube, and I feel a slight difference. The car seems to be a tad louder (nothing obtrusive) from the intake side, a small perceived change in the exhaust note, and the car seems to pull a bit harder above 3500-4000 RPM. I drove the car on about a 70 mile round trip, mostly highway, and accellerated hard from the tolls. This is where I felt the slight perceived harder pull.