The 'D4TH Blossom' SMG's Level 4 upgrade is described in-game as: "Armor piercing bullets do more damage and pass through armor".
What counts as an armored target? What targets will the D4TH Blossom's bullets pass through, and what targets will take more damage? Are vehicles, aircraft, structures (like the ones you destroy in missions) or brutes considered armored for the purposes of the'D4th Blossom' SMG's Level 4 upgrade?
Note: I've read the Saint Row Wiki's D4TH Blossom article, where it states that it "penetrate the hulls of light vehicles to hit targets behind them (I.E. it can shoot through a door to hit a driver), and allow it to puncture riot shields." So besides that, are there any other targets that are affected? Or can anyone expound on what vehicles count as a "light vehicle" or not? Will vehicles take more damage from a Level 4 D4TH Blossom?