Check out the Stereo Integrity M3 Carbons. I just put those in my car (tried out a few other speakers as well before deciding on those). I don't think the Unity 8s would make sense for this install, since he has an MD100. I like the Unity 8s, and installed those in my brother's car, but that was a tweeterless application, which I think is what the Unity 8s is more known for. I'd think he'd want the 3 or 4" mid to play a bit lower, though.