Good thread, but could've been in /awg/. I personally think it's a fun game. It uses only 6 sided dice, and there are custom d6 they sell with icons printed so you don't have to look at a chart to understand results. That said you can try the game for free if you have someone to play with, just grab a couple hotwheels (or buy them for $1), download the pdf, and print out the templates and stat sheets.
I haven't gotten around to modifying my cars yet, I'm holding off until I introduce my dad to the game so we can work on our cars together. There's plenty of gameplay videos that will help you understand the mechanics, but the gist is this -
It's a small army size skirmish wargame with cars. Different gears (as in a transmission) will allow you to use different movement templates and increase your odds of evading attack or dealing damage in a collision. There are different classes of cars (buggy, car, performance car, monster truck, truck, etc) that will have different base stats and available "build slots". Army building works in that you're given a budget of points (called cans) to spend on buying vehicles and / or upgrading them with armor, guns, abilities, etc. So for example say you were building a standard 50 point team. You could spend however many points on a standard truck. If you want to add weapons or armor or what have you you'll need points (cans) as well as available build slots for that vehicle.
I think the game play is very enjoyable. It's relatively fast paced and the dice chucking and general sense of chaos/luck fits with the theme. It's a good game for a good time but not something you'd play competitively. Picking up templates without measuring and narrowly missing a collision feels great, and rolling a Slide on your die roll right when you need it to extend your template and change direction to open fire or line up your next turn is lots of fun.
Tl;dr just check /awg/, get the pdf and try it. Watch videos if you're interested.