Bought 4 of the pro bullet loud speakers to upgrade the factory speakers in my 02 Audi a4 revived the speakers within a week even with a holiday weekend in between. Install was easy with a little modification of the old speaker housing it fit perfect. Also was able to pull the casing off of the 2in pei dome tweeter and slide it right where the factory tweeter went with no modifications and it stays perfect for a clean factory look all around. The sq is very impressive and almost twice as loud as my factory system. Note all of these speakers are just run off the head unit no amp yet and they are still amazing, looking at getting the 300w 4 channel amp sold by ds18 to finish it off