I would like to extract these files. I have found tools for the texture files and for the pig models used for the cars and the levels, I couldn't find ANY mentions of this filetype online

 the files in question can be found in [GAMEDIR]\Data\models\

seems to be a specific version for the .pig format, i used the rival wheels version and it worked but it's always luck if it actually exports

the rival wheels version? can you link that if possible?

Looked all over on how to extract. Tried a few things myself but no results. Please link whatever version you're referring to.

Maybe you meant the driver from Rival Wheel, "animated_biker_v2.pig", but that doesn't work for a8tool nor pig2fbx

Additionally, there exist "avatar_legs_002_test.pig" and "avatar_torso_002_test.pig", and those convert just fine, with no textures (there probably weren't any to begin with).