Can you swap a b20 in a 91 integra ls with a manual transmission?

Yes, you can swap a B20 engine into a 1991 Acura Integra LS with a manual transmission. The B20, commonly from the Honda CR-V, can fit into the Integra's engine bay with some modifications, including adapting the engine mounts and wiring harness. You'll also need to ensure compatibility with the transmission and possibly modify the intake and exhaust systems. Overall, while it’s a feasible swap, it requires careful planning and some mechanical skills.