Hell no! I did my whole truck in that BS... Your friends must have never used real deadening then.
My car is done in AlphaDamp. Good stuff. Plate is deadened and I have a piece of foam behind it. Only thing that rattles is my spoiler....
2010 Focus coupe 5 speed
Projector retrofit/LED tails/ Pioneer 80prs/(2)AQ2200D/BK800.4/6 SQ pro mids/4 SQ supertweets/AlphaDamp/HDC3 18"s walled/ Juicebox G31/ DC power 270XP Alt/
A lot of mods.