Physics Bounce More Than 1

I want my objects (cars) to bounce off each other more than what's current max value in "Bouncy" physics material. I managed to, somewhat, achieve this by multiplying rigidbody.velocity but I'm getting some weird behaviours and speed boosts since those cars are hitting each other very often.

How could I achieve that, bounce more than 1, effect without directly changing rigidbody.velocity value?

 

Rigidbody.AddForce use this with OnCollisionEnter() so that when the car hits another car(maybe add in a tag check so it only does it when it hits another car.) it adds force in the opposite direction to emulate a "bounce".