Re-Volt Zone is the place to go if you want new tracks to race on or new cars to race with. Installation is straight forward:

Installing Fan-made Tracks/Cars:
- Navigate to a track on Re-Volt Zone and click on the picture to download the track.
- Open the ZIP file and extract its contents to your Re-Volt folder (C:\GOG Games\Re-Volt\).
- If asked, merge all folders.
- Restart Re-Volt.

That's it, have fun!

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Below is a list of my own favorite tracks and cars:

Tracks by 'Human':
Helios
Jailhouse Rock
Sakura

Tracks by 'Gabor':
Quake!
PetroVolt
Venice

Other tracks:
Amco TT by RVTT Team
WipeOut by hilaire9
Road in the Sky by Killer Wheels
CTR Palm Marsh by Killer Wheels and Darksabre

Cars
Thunder Tiger BX by MOH
Stealth XB by hi-ban
Pulse 4.6 by hi-ban
Slash 20VXL by hi-ban