The CG911B was the updated version of the CG911 designed by Chris Murphy and Gustav Brunner for Leyton House Formula One team for the 1991 Formula One season. In 1992 Leyton House was rebranded as March F1, after they were sold to a consortium led by Ken Marrable, John Byfield, Tony Birchfield, Gustav Brunner and Henny Vollenberg. The car was powered by Ilmor V10 engine and was driven by Austrian Karl Wendlinger and French Paul Belmondo. Wendlinger’s 4th place in Canada was the only point finish for the team in 1992.
The son of actor Jean-Paul Belmondo, joined the team as a pay driver, getting a ninth place at the Hungarian Grand Prix, but only qualifying 4 more times. After his money run out, Belmondo was replaced by Italian Emanuele Naspetti for the five last races of the season. For Naspetti it was an important decision that forced him to abandon the FIA International Formula 3000 Championship while leading it a few races before the end. Naspetti finished three out of his five 1992 races in March but scored no points.
| Season | Series | Event |
| 1992 | F1WC | Portuguese GP |
| Driver | No. | Entrant |
| Emmanuele Naspetti | 17 | March F1 |
| Scale | Manufacturer | Collection |
| 1:43 | Spark | |
| Cat. No. | Quality | Rarity |
| S1663 | 
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