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The only other upgrade that effects vehicle performance in GT Auto, is the Roll Cage. A Role Cage will very slightly increase chassis stiffness, this does not increase performance points anymore. Role Cage Type A, B and C, all have the same performance effect. This upgrade has no downsides, making it a mandatory upgrade.
Standard Parts
Roll Hoop
Roll Bar
Roll Cage Type A
Roll Cage Type B
Roll Cage Type C
Increase Body Rigidity & Roll Cage Overview will cover these upgrades in greater detail.
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