People also think that Kymco accidentally inserted a rubber part into the air intake tube, which is retricting the air flow in the tube to the air filter box.
To get more _______ (your choice, "noise", "power", "speed", "mpg's") just pull out that restricter.
IMHO, lads at Kymco might have put it there to increase the velocity or pressure of the air stream. So I spend my time checking the tire pressures.
Stig