I don't think burnout 3 has any cheats, sorry.
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You can't. You can only use cheats in The Sims 3 for PC or Mac.
Burnout 2 in my own opinion is better to play when you feel like actual, normal racing. If you feel like having an aggressive race with a bit more to it, though, then try burnout 3. i.e. play burnout 2 if you like classic racing, otherwise burnout 3.
Yes, if you get the new update which is out for ps3..not sure about x box...go on www.mercs2.com for details
No as the PlayStation 3 Blu-Ray discs are too large to fit in the DVD slot on the PlayStation 2, although you can play most PlayStation 2 games on American PlayStation 3's and around 50% of PlayStation 2 games on European PlayStation 3's.
PlayStation x PlayStation 1 PlayStation 2 PlayStation 2 slim PlayStation 3 PlayStation 3 slim Coming soon - PlayStation 4