Step 1: Clean the surface of your tailpipe.
Clean the dirt and sand on your tailpipe with penetrating oil and a shop rag.
(Make sure your tailpipe is at room temperature, and do not clean the surface of the tailpipe after the car just went out)
Step 2: Slide the exhaust tip into your tailpipe.
Step 3: Fasten / weld the exhaust tip.
Tighten screws and clamps to secure the exhaust tips. Should you worry that it is not tight enough, you can weld a joint between the edges of the tailpipe and the exhaust tip.
THEN, THE INSTALLATION IS COMPLETE.