This is Porsche 911 (964) car pack. There are 5 models in it:

Porsche 911 Turbo S Leichtbau
Porsche 911 Turbo S Flachbau
Porsche 911 Turbo 3.6
Porsche 911 Turbo 3.3 Cabriolet
Porsche 911 Carrera RS 3.8

Original model Porsche 911 Turbo S Leichtbau: Forza Motorsport 7
Transformed to other versions by Rogue90
Converted to GTA5 by Rogue90

Features:
HQ Exterior
HQ Interior
HQ Enginebay, trunk and doorsills
3d undercarriage
Real life light setup
Dirt mapping
Breakable glass
Hands on steeringwheel
Working steeringwheel and dials
Reflections on mirrors
GTA 5 license plates
Correct door opening
Bullet impact
Correct window tint (no tint on lights & windscreen)
Correct exhaust smoke position
Wheels don't disappear in the distance