I dont really know alot about car audio. I bought my car from a dealer and someone had alot of money in the system of the car. It has a nice clarion head unit and the mach sound system has been by passed and new wires ran. The tweeters are hooked up but the speakers are all but blown. It has pioneers in it right now and the are shot! I have a 500w sony explode amp in the car as well. I want to put some new speakers in the car. I know the size I just need to know what speakers to go with. I want clarity and great sound. I want to be able to turn it up as loud as I want with no distortion. I dont have subs but I may get some. Idk. Just want sound quality. I listen to mainly rock and country music. But the occasional dubstep comes in sometimes lol.

If at all possible dont just say a brand. I need models and brands. Help me out guys!!! Thanks!

 

You might have better luck asking in the audio section.
Other than that, I would suggest checking on Crutchfield or a similar site.
I have personally used Alpine in my vehicles in the past, but this Mustang is still stock as far as the sound system goes.