IMHO, I wouldn't spend any $ on things like that. It's not like a '13 Leaf has much value to begin with.
If the car gets totaled, you might have trouble recovering much of the $ you put into it. If you want to sell, buyers may not want to pay any more for your vehicle vs. one unmodified. I wouldn't. In fact, it might even be a liability.
If you plan to sell via other means like Shift, you might have problems. From https://support.shift.com/hc/en-us/arti ... n-pricing-
As a company policy, shift does not add value to vehicles for aftermarket modifications. Market research has shown that aftermarket components rarely have a positive impact on the vehicle’s value. Aftermarket components on a vehicle outside Shift’s standards will result in its disqualification. Aftermarket modifications related to the suspension, exhaust, wheels and tires, electronics and stereo, and engine modifications are active disqualifiers. Modifications to the exterior and interior of the vehicle have the potential to void the warranty on the car.
If you try getting an estimate from Carvana, it asks:
"Are there any modifications to your vehicle (e.g. suspension, engine, etc.)?"