Tuning includes this kind of modifications too sir. I think i'll give you the exact tuning definition from Wikipedia
Car tuning is both an industry and a hobby, in which an automobile, motor bike, scooter or moped is modified in order to improve its performance, handling and appearance and improve the owner's driving style.
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2 Areas of modification
2.1 Audio
2.2 Interior tuning
2.3 Engine tuning
2.4 Suspension tuning
2.5 Body tuning
2.6 Tires
2.7 Detuning