This is a test of commonsense. Complete the next sentence:

How to install an exhaust system
Lift the car.
If you don't have a lift, jack up the back end so you can get under it. Use ramps or a jack, whichever you have.
Be sure to lock the emergency brake and chock at least one wheel that is still on the ground. Make sure to block the car using jack stands, wooden blocks or other sturdy blocks.