Tuned Car Upgrading

Im just wondering if the tuned cars for example, the RocketBunny S15 are upgraded because they are "tuned" or can i still put on upgrades like Piston Kits, ECU's, And stuff like that? Would help a lot in the process of buying a new car. (i mainly meant do they have stock parts or like the best parts ingame)

Yea man, You def can, they just come with a good kit and wrap/body workk ya know.

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