Becareful changing out your tail lights. While I won't get into the whole debate about Euro/Altezza lights looking good or not, I will say that it is illegal to change them and if you're rear ended in an accident, even if it is not your fault, you will almost certainly be blamed. If they make it stick, you could be out a lot of money that with the stockers, you wouldn't be. Something to think about before you make the leap changing your lights.
As for the dull look... if you mean it looks plain, I can't help you, but if you mean it physically looks dull or cloudy... you may want to try cleaning it with some tooth paste. Tooth paste is a very mild abrasive and is great for cleaning clear plastic... getting ride of the dull look.
As for the dull look... if you mean it looks plain, I can't help you, but if you mean it physically looks dull or cloudy... you may want to try cleaning it with some tooth paste. Tooth paste is a very mild abrasive and is great for cleaning clear plastic... getting ride of the dull look.