Who says I'm getting nasty. I'm telling you it has been done.
I guess nobody here has ever tried or ever succeeded at it other than the PC version? And to point out I already knew about the hacks and the others which you can put on, I was down college the other day and whilst on break I noticed some guy playing GTA IV on 360 with custom mods in the common room. Obviously I did ask him how they got there but his response was "No idea mate, just got here and started playing and to my surprise there are custom mods".
But ok, if you guys know that you cannot do so. Then don't worry about it :)