Choosing your own bonus code:
Use the following trick to change your bonus code. For example, if you want to use 
the cheats for "9535" but your number is different. Delete your game file from 
your hard drive, then reload the game. You will have a new bonus code. Repeat 
this process until you get the desired number. 

Code notes:
The game's codes are matched to the bonus code of each game, which will vary. 
The following codes will only work with discs that have the same bonus code. 

All cars and tracks:
Enter XCHAMPS as a code. Alternately, enter CHAMPS as a code.

All cars and default championships:

Enter AFRDKGIT as a code (bonus code 0798). 
Enter LRCHMRVV as a code (bonus code 1335).
Enter HZOLQCKO as a code (bonus code 1802).
Enter FRKBPWYY as a code (bonus code 3803). 
Enter KTQMDZYIas a code (bonus code 4707).
Enter VTFLCBEN as a code (bonus code 6068).
Enter TSCNJDRS as a code (bonus code 7018).
Enter NYOOTWCF as a code (bonus code 8426). 
Enter LRCHBQJ as a code (bonus code 9535). 

All cars and bonus championships:

Enter EJEUBCQP as a code (bonus code 0798). 
Enter GXZCYULV as a code (bonus code 1335).
Enter FRKBMNAN as a code (bonus code 1802).
Enter HZOLAQEZ as a code (bonus code 3803). 
Enter VRWZWIIEas a code (bonus code 4707).
Enter OTNUUYYY as a code (bonus code 6068).
Enter UDFCGFCM as a code (bonus code 7018).
Enter NYOOTWCF as a code (bonus code 8426). 
Enter GXZCDRMQ as a code (bonus code 9535). 

Double engine power for all cars:

Enter CWVFUETA as a code (bonus code 0798). 
Enter LBHXHAUV as a code (bonus code 1335).
Enter VJMECNYO as a code (bonus code 1802).
Enter NYSGFPXE as a code (bonus code 3803). 
Enter NYLLXYMTas a code (bonus code 4707).
Enter TKDSPYHV as a code (bonus code 6068).
Enter NULPUXTH as a code (bonus code 7018).
Enter LLNWUGXT as a code (bonus code 8426). 
Enter LBHXBAAA as a code (bonus code 9535). 

Front wheel drive becomes rear wheel drive: 

Enter MNEYYXVK as a code (bonus code 0798). 
Enter DEPEUBUX as a code (bonus code 1335).
Enter NYSGKJKW as a code (bonus code 1802).
Enter VJMEHNZR as a code (bonus code 3803). 
Enter OYKAKZJQas a code (bonus code 4707).
Enter NXJGVUOI as a code (bonus code 6068).
Enter ZRIGBHBY as a code (bonus code 7018).
Enter DBXLYJUU as a code (bonus code 8426). 
Enter DEPEXGAA as a code (bonus code 9535). 

No damage:

Enter EZXYFQWV as a code (bonus code 0798). 
Enter ILKGNSYX as a code (bonus code 1335).
Enter VRWZULGR as a code (bonus code 1802).
Enter KTQMNLEY as a code (bonus code 3803). 
Enter FRKBNMUEas a code (bonus code 4707).
Enter AMYKURRW as a code (bonus code 6068).
Enter XGAAYRSP as a code (bonus code 7018).
Enter GFNPIDBY as a code (bonus code 8426). 
Enter ILKGJIGV as a code (bonus code 9535). 

All FMV sequences:

Enter RQPJVUDH as a code (bonus code 1335). 
Enter KTQMSHYI as a code (bonus code 1802).
Enter VRWZMNGW as a code (bonus code 3803). 
Enter HZOLMXZNas a code (bonus code 4707).
Enter KRCQTBPU as a code (bonus code 6068).
Enter BAAAQEPU as a code (bonus code 7018).
Enter WVUMRQMJ as a code (bonus code 8426). 
Enter RQPJZZOU as a code (bonus code 9535). 


Any Car, Any Track on LIVE :

It's possible to race any car on any track on XBOX LIVE. Follow these steps:

1. Create a session. 
2. Go to "settings". 
3. Select the series with the car you want to race (ex: DTM). 
4. Press A to select that series. 
5. Press "continue". 
6. Go back to "settings". 
7. Select the series with the tracks you want to race (ex: StockCar). 
8. Press A to select that series. 
9. Do NOT press continue. Go back into the series selection screen. 
10. Select the series you had previously (ex: DTM). 
11. Press A. 
12. Press "continue". 
13. Go to "track" 
14. Press "X" to "reset championship" 
15. Go to "track" 
16. Select the track you want from those listed (ex: Texas) 

And voila, you have any car at any track. In this case, you'd end up racing DTM 
cars at Texas