The project is reportedly codenamed “Highland.” For a few years now, Tesla has been integrating its large casting technology into the Model Y with single large casting parts replacing dozens of parts in the electric SUV. Advertisement - scroll for more content This new technology has enabled Tesla to greatly improve manufacturing efficiency with the Model Y compared to Model 3. CEO Elon Musk said that Tesla will bring the same technology to the Model 3 eventually, but he couldn’t exactly say when. The problem is that such an update to the Model 3 would temporarily slow down production, and Tesla couldn’t afford that while it was still ramping up Model Y production. However, Model Y production is now starting to exceed Model 3 production, and it could be good timing for Tesla to update the Model 3 using the technology.