Thank you for the review. I'm not sure what you mean by lack of tuning because all my engines have the same amount of customization in the parts selector as the default engines. The issue with the RPM fall off is where the engine data ends in the .json file, which is similar to the real-life max RPM of the engine and different for each engine. I agree that the mod size is very large, however, that is due to the variety of engine sounds exported from Automation. If I can find a way to reduce the mod size while keeping the variety of engine sounds, I will do so.