Can I put a e55 engine in it or a m273?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! I say go for it! Anything is possible with enough time, money, and resources! Just be aware that swapping a different engine into your Benz is technically feasible but highly complex. It involves significant engine mounts, wiring harnesses, and exhaust system modifications. Integrating a different engine will also require reprogramming and replacing the vehicle's computer system to ensure compatibility and proper functioning. Changing the transmission adds another layer of complexity, as it must match the new engine's power and torque characteristics. This swap would likely be very expensive and require extensive customization. Consulting with a professional mechanic or automotive specialist experienced in engine swaps would be advisable to assess the feasibility and potential challenges specific to your project. Either way, it sounds like a pretty rad idea! If you have any other questions, please call us at 877-913-1554! We'll gladly find you a certified RepairPal shop in your area!