accent motor tuning

[eugenghiulea]

Hello,
I've got an Accent 2003 1.3 GL, 85 bhp, euro 3.

1. Does anybody know what is the black box in front of the air filter? What is it doing? What happens if I remove it?
2. Actually, I want to replace all air filter sistem with an induction kit (K&N, Pipercross, Green ...). Anybody did this? My dealer told me that I will get "check engine" light on.
3. Did anybody tune the chip? How, where, how much and what was the result (power, torque, consumption)? Does it worth? (your opinion)

4. Consumption is realy 5.1/7.8 L/100km, but only on summer. On winter, under 0 deg. celsius, consumption rises with 25%. It is normally or it may be somethig wrong with my car ?

Thank you a lot and have a nice day ... every day.

[eugenghiulea]

5.1/7.8 L/100Km = 47/30 mpg
non agressive riding