You might need a mod for the ECTO 1 car. Suggest you check out gtawiki and their comprensive sections on modifications and and also cheats:
gta.wikia.com
Nope.
890-453-9655 is the cheat of nitro in GTA iv PS3.
There is nu Bugatti in GTA IV, only if you play it on the PC you can download a mod wich cganges an ingame car to a Bugatti
No, there is not an armored truck cheat for GTA IV.
Probably, there no flying car cheat GTA IV. Its only on GTA San Andreas... The peoples who makes the code is fake. The fake code is 321-555-0100
no
Unfortunatly there isn't. But the Comet is the fastest car in the game. Here's the cheat - 227-555-0175
its a mod, no cheat
No, There is not a ragdoll cheat for GTA IV.
They are on Google.ca
No there is not
You
Nope.