User blog comment:DonVecta/GTA VI (or DLC for V) concept cars (might have illustrations)/@comment-24887354-20150320181206

Here are a few concepts:

Pfister Comet GT - Porsche Carrera GT

Karin Knight - 2006 Subaru Impreza WRX STi

BF Fripon - 2009 VW Scirocco

Vapid Perception - 2013 Ford Focus

Vapid Boost - Ford Capri MK2

Ubermacht Schneller - BMW M1

Obey Mimaum - 1984 Audi Quattro