1. It depends on how many cars you've hit, what type of etc. If you for example have 200k damage from cars by alone, and 20 exploded, you do the math, 200,000 x 20 = 4,000,000. In that case it would give me around 300k bonus damage. 2. I wasn't close enough to make it explode. It's also because of the car I used, it doesn't really have strong crashbreaker explosion. That's why Sports C180 or C190 is the favorite in the crash mode. Sadly you can't change the car in this event.
