By Dean Carr BetMGM is offering new customers the chance to claim $158 in bonus bets with the BetMGM bonus code NDBONUS ahead of the NFL Conference Championships. The Kansas City Chiefs face the Baltimore Ravens before the Detroit Lions head to the San Francisco 49ers in Sunday’s double header that leads to the Super Bowl on February 11. To claim the $158 in bonus bets, new players at BetMGM must sign up using the bonus code NDBONUS and place a $5 qualifying bet on any sportsbook market. BetMGM will instantly credit your account with $158 in bonus bets, regardless of the outcome, when this qua…