Summary: Let me start off by saying these speakers are amazing! I installed these in the front doors of my 2004 Pontiac Grand Am and wow what at difference over those little 4x6 speakers. These speakers have really clear and crisp sound, great bass.
Pros: Clear and crisp sound, great bass, hard to distort.
Summary: Will not need adapters for challenger. Took factory speaker and took out the cone, then cut the basket off so I could slide, (more like force it into) the new speaker into the ring that is left and screwed back into rear deck. Sound great.
Summary: I love them. They replaced my "premium" factory speakers in my PT Cruiser. I'm hearing things I never heard before. It's crystal clear. Crutchfield supplied the adapter and it fit easily enough. I did have to drill one hole but it was simple.