Official customization overview
Steam markets deep customization and asks players to customize their ride to the max. The official website highlights rare car parts that breathe new life into your ride. Those claims are Official; acquisition systems and a full parts catalog are not yet documented.
Visual customization
Hands-on Demo coverage from The Drive and Out of Games reports body kits, vinyls, and underglow neon among the visual options available in the current Demo. Exact catalog size for the full game is unknown.
Performance upgrades
Demo hands-on reviews also describe performance upgrades. The exact upgrade tree, part tiers, and final-game balancing have not been officially published.
Rare car parts
Rare car parts are an official feature on heatwarped.com. How players find, unlock, or purchase those parts in the full game remains undocumented.
Heatwarped Demo customization
The current Demo offers a customization preview rather than a claimed final catalog. Multiple independent hands-on articles report a single currently playable fictional car in the Demo — customization is explored on that ride, not across a published roster.
Known parts / names
The Drive mentions a body kit name observed as Ab-Smug. That string is recorded here as a hands-on observation only. Additional exact in-game names will be added when they are verified in Demo UI or official materials — not guessed from car-brand lookalikes.