novice question about this sick a$$ camaro

[irishlsxer]

What is that sticking out beneath the bottom of this car? That piece that they painted body color that is almost touching the ground? Why is it sitting that low? A custom subframe? That looks scrapping-dangerous....I'm shooting for a similar look, and was planning on a full sub up front and four link in rear...maybe not quite as low, and would prefer not to have whatever that is hulking out from underneath the car waiting to hit some road debris

http://www.interiorsbyshannon.com/1969_camaro_scott.htm