I bought those same parts, buts separate on amazon, It was all the right stuff the but the Wiring harness module was DOA. Your lucky yours came with the NAv Bezel, i had to buy that and it was around 150.
BWoody 4", Intune, Muffler Delete, Jet 180, Catch can and De-Badged
Understeer is when you hit the wall with the front of the car.
Oversteer is when you hit the wall with the rear of the car.
Horsepower is how fast you hit the wall
Torque is how far you take the wall with you.