I just joined the forums looking at this discussion. I own a chevy spark 1.2. I'm thinking of doing this mod to my car too. Thanks for the information everyone. At my place it never snows and barely even rains. So I don't have to worry about hydrolocking the motor. Would perform the mod update the info again. And I will reset the ecu too at the same time so that it will adapt to the new air-fuel ratio.
At the 15,000 mile oil change I went with liqui moly full synthetic 5w30 and the engine became smoother at idle. It is smooth all throughout the rev band. The throttle became a bit more responsive. Definitely recommended.
The image is from when I removed the intake to clean up the engine bay a little bit.