I have a few suggestions for the engine and car managers.
First would be adding the design year to the displayed information on the managers to help with general organization.
Second would be the option to sort the cars/engines by the stats on the manager so that, for example, you could quickly find the most efficient engine for your newest hatchback or whatever.
Last suggestion would be if you can find a place to cram it in the UI, would be the ability to compare the stats of two different cars/engines side by side.
