I can see how much it took to create this. I imagine the effort put into a single, poor replica spread over a whole pack.
My individual thoughts towards each vehicle are below.
Porsche 911 (Replica)
This car has no headlights, and an empty front. The rear wing is, well just straight up wrong. The wing would normally have multiple intakes on it, but this is just wrong. There is a part that replicates it pretty perfectly, I just forget where it is. There are also headlights of the right era somewhere, I just forget where.
Aston Martin Vulcan (Replica)
This car looks like it wants to die. like, really wants to die. The rear attempt on what i'm assuming to be LED taillights are in the wrong position, and the rear vent is also in the wrong position, as it is supposed to be a diffuser. There is a rotated hood intake on the real vulcan, but this is just a double intake here. Headlights should be under the hood, or split. The front vent should be an intake, but I understand that there is none you can really find, so I'll let it go. The side vent should be carbon fiber trim, The wing is also wrong. Also, the car is not a convertible, it is a hard-top.
Audi R8 V10+
Headlights and taillights are wrong, and this car's rear looks like it wants to die even more. It doesn't look sharp and snappy like the real car, and instead it looks like a hammer over a scalpel. Large rear vent should be moved down as well.
Mercedes C63 AMG Black Series
It is a bit off, but asides from the fact that the rear taillights are missing completely, this looks like an OK replica that seems like was taken from a reference image or two.
This is the definition of a "ricer gone wild" in a car. Covered in carbon fiber wrap with flame decals and flipped headlights with side exhausts, this car makes me want to die.
I don't want anybody to feel personally attacked by this review, and I do hope the creator gets better at replicas and custom car making. Notice I didn't review the custom car because it is not supposed to be replicating another car. I appreciate that you put some effort into creating an automation mod pack, and I did enjoy driving these around, and I do legitimately hope that you get better at car-building. The forum is so over saturated with low-effort automation mods, and I'm glad there is at least a modpack with multiple vehicles out there.
Hope you get better, and bye!