Hi ! My Lupo Bj. 99 55kw petrol, probably got a sports filter installed, at least the previous owner claimed that. The engine is also very loud. Well and the suit is not without especially the engine sound. Unfortunately, the Lupo consumes about 10 liters that is not normal. I make the sport air filter responsible as an evildoer !!??! Or do you have a different opinion !?!? I would like to rebuild it. Question How? And where can I get a standard air filter cash? The air filter box in the engine compartment is also hard to reach !?!? Would I be happy about help. Thank you very much Genious