Sledge hammer if you can knock the stud from side to side to loosen it up. Monster pry bar a little at a time.
But, you know you can just drill through the studs...make holes through the studs at least 1 1/4 inch back from surface of wall...in the center of stud. You can easily fit a couple of wires in a 5/8" hole...make hole bigger if needed and keep it up from the floor....12-18" or so...some level comfortable to drill at.
Upcoming comedy shows: March 3 at Broadway Comedy Club, NYC, 8 p.m. March 5, Tierney's Tavern, Montclair, NJ, 7:30 p.m. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!