severe steppe
They should add like some engine variants
Regular - normal boring engine lol
Speed: 70
Refined Engine - cool engine that costs $$
Speed: 100
Custom Engines
basically you can buy a engine shaper thingy and you can put stones / materials (obv not wood) in it and select an engine type:
V4 - 20,000 Cash 6 Materials 95 Speed (Base)
V6 - 40,000 Cash 9 Materials 120 Speed (Base)
V8 - 69,000 
Cash 12 Materials 145 Speed (Base)
V10 - 80,000 Cash 15 Materials 200 Speed (Base)
The engine will be customizable like this:
🔵 ⬛ 🔵
🔵 ⬛ 🔵 V6 for example
🔵 ⬛ 🔵
Each of those Dots/Squares is a material
It can be filled with Uranium/Magnetite/Gold/Mythril etc.
Depending on the rarity of the stone it will be better, (Stones have to be refined but not in bars)
Then you can put it in your car.
(THIS WAS ORIGINALLY POSTED IN THE ''Car Upgrades /customization concepts'' FORUM)
eternal burrow
formal edge
rigid ore
left brook
errant raptor