new speakers help

[lulwut 10+ year member]

i need to know what kind of wattage and size to get to replace my speakers in my car. whenever i turn my music loud and the bass hits i get a popping sound in the front speakers. i have an after market stereo and the size of my factory speakers are 5 1/4 and i can go to 6 1/2 in size. any suggestions if i should get an amp or run it out of my head unit?

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