Toyota supra is really good mod, but it doesn't mean that any other one cannot have comparable damage.
Note that rF supports maximum 10 debris objects. So lets's count: rear bumper, hood/bonnet, boot/trunk, four lights, 2 mirrors, exhaust - that's 10. Alfo FWING, WING and WHEELs may be detached. That's all. In common cases it is enough. So, as you can see there is no need to have some super-detailed model. But after that, it is up to modder to define correct values of deformation and forces causing parts detaching. It is really not a problem to set minimum impulse to some low value, for example 1500-2000. ...Maybe only with drivers who are not accustomed to crash car to death by hitting a wall with 60 kmph.
BTW: one of the problems with debris are, that light objects like blglo and hlglo may not be detached. Which is really pain in ass. Just imagine, that lamp fall down but light glow is still on place. Some workaround is to set those objects as deformable. In most cases they will hide glow over some other objects.