"Should be..."
...
Upgrade, upgrade, keep upgrading!
Sitting inside the train compartment, Chen Mang looked again at the remaining parts, fixing his gaze on the "Car Sound System," consuming 502,500 units of iron ore to upgrade it directly to Level 100!
This thing being upgraded to Level 100 is probably useless; his main goal was to make it more durable, so it wouldn't nearly break to zero integrity after every battle.
While life-oriented parts won't possess the same strength as defensive parts, they will become more robust with level upgrades.
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"Car Sound System Level 20 Supermodel Effect": None.
"Car Sound System Level 50 Supermodel Effect": None.
"Car Sound System Level 100 Supermodel Effect": None.
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No supermodel effect, as expected, but he wasn't aiming for any supermodel effects when upgrading it.
The rest...
