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Found six prototyping r8 3d models.

$129
cg-trader
Audi R8 eTron Prototype 2013 3D model
$75
3d-export
Audi R9 Prototype Car 3D Model
$150
turbo-squid
Sports Car Collection 2
free
grabcad
Racing seat prototype
free
grabcad
AUDI R8
free
3dwarehouse
2016 Alexander 131R LM