ideas for insulating garage/wall ceiling covering

famous bob,our other house had an attached garage below the bedrooms,raised ranch,and the garage was drywalled and taped.One day I start my Dart up in there,open headers.As I rev'd it up,BAM!A piece of tape and joint compound hit the windshield....I think that was also the time Mom came down and said I was rattling her teeth.They were real not dentures.