Your car looks really good, but I’d say that with a drivability of 13 your car isn’t as fast it could be 
Also both comments from strop and squidhead are really on point, but you’ll get there
I have yet only made one super car, but as you can see, you can accomplish a lot with less costs and production units.
A few more comments, try to lower the weight (light materials and negative quality on interior and safety might help), and don’t be afraid of losing some realiability by increasing your rev limit