Forza Motorsport 3 Cheats & Codes

Online Money Making Glitch :
Before getting started with this cheat you'll need a some cash on hand, a cooperative online counterpart and private lobby.

1) Buy a 1969 Chevrolet Camaro Z28.
2) Buy every engine available for that car.
3) Buy every part for every engine including every aspiration part.
4) Back out to the main menu so it will the engines and parts you purchased.
5) Head back to the engine purchase menu and sell every engine (DO NOT LEAVE THE ENGINE MENU).
6) Press your Xbox 360 button and join your friend's lobby.
7) Leave the lobby and quickly press B to back out to the title screen (the screen that says 'Press A to Start').
8) Go back to your engine purchase menu and you will still own all the engines and parts.
9) Repeat steps 5-8 for infinite engines you can sell for infinite cash.

Cars
The following cars can be unlocked by performing the actions below:

Driver Level 01 - 2010 FIAT Abarth 500 esseesse
Driver Level 02 - 2009 Alfa Romeo Brera Italia Independent
Driver Level 03 - 2009 Volkswagen Scirocco GTI
Driver Level 04 - 2003 Renault Sport Clio V6l
Driver Level 05 - 2009 Ford Forcus RS
Driver Level 06 - 2004 Vauxhall VX220 Turbo
Driver Level 07 - 2007 Ford Shelby GT500
Driver Level 08 - 2008 Maserati GranTurismo
Driver Level 09 - 2010 Chevrolet Camaro SS
Driver Level 10 - 2006 Lotus Exige Cup 240
Driver Level 11 - 2009 BMW Motorsport M5 E60
Driver Level 12 - 2009 Lexus IS F
Driver Level 13 - 2007 SEAT Leon Supercup
Driver Level 14 - 2005 Honda NSX-R GT
Driver Level 15 - 2009 Ferrari California
Driver Level 16 - 2009 Jaguar XKR-S
Driver Level 17 - 2002 BMW Motorsport M3-GTR
Driver Level 18 - 2007 Peugeot Super 2000
Driver Level 19 - 2007 Alfa Romeo 8C Competizione
Driver Level 20 - 2010 Audi R8 5.2 FSI quattro
Driver Level 21 - 2005 Ford Ford GT
Driver Level 22 - 2009 Mercedes SL 65 AMG Black Series
Driver Level 23 - 2005 TVR Sagaris
Driver Level 24 - 2008 Porsche 911 GT2 (997)
Driver Level 25 - 2008 Lamborghini Reventon
Driver Level 26 - 2002 Nissan MINE'S R34 Skyline GT-R
Driver Level 27 - 2006 Ferrari 599 GTB Fiorano
Driver Level 28 - 2006 Lamborghini Miura Concept
Driver Level 29 - 2008 Dodge Viper SRT10 ACR
Driver Level 30 - 2009 Bugatti Veyron 16.4
Driver Level 31 - 2009 Holdon #2 Commodore VG
Driver Level 32 - 2006 Ferrari #62 Risi Competizone F430GT
Driver Level 33 - 2008 Porsche #45 Flying Lizard 911 GT3-RSR
Driver Level 34 - 2009 BMW Motorsport #92 Rahal Letterman Racing M3 GT2
Driver Level 35 - 2005 Ferrari FXX
Driver Level 36 - 2007 Chevrolet #4 Corvette C6.R
Driver Level 37 - 2008 Nissan #23 XANAVI NISMO GT-R
Driver Level 38 - 2006 Aston Martin #007 Aston Martin Racing DBR9
Driver Level 39 - 2008 Lexus #6 Eneos SC430
Driver Level 40 - 2008 Konigsegg CCGT
Driver Level 41 - 1997 McLaren #43 F1 GTR
Driver Level 42 - 2005 Maserati #15 JMB Racing MC12
Driver Level 43 - 1998 Porsche #26 AG 911 GT1-98
Driver Level 44 - 2003 Saleen #2 Konrad Motorsports S7R
Driver Level 45 - 2008 Porsche #7 Penske Racing RS Spyder Evo
Driver Level 46 - 2009 Mazda #16 Dyson Racing B09/86
Driver Level 47 - 2006 Audi #2 Audi Sport North America R8
Driver Level 48 - 2009 Acura #66 de Ferran Motorsports ARX-02a
Driver Level 49 - 2006 Audi #8 Audi Sport Team Joest Audi R10 TDi
Driver Level 50 - 2009 Peugeot #9 Peugeot Sport Total 908

Rewind Exploit :

If you rewind a race when the computer cars are not single file, any cars not in the optimum line for that stretch often will do a sharp S-swerve to the optimum line once the race resumes.Not only does this cause a slight dip in their speed, but can occasionally result in collisions. Both of these outcomes provide passing opportunities for you -- just watch out for opposing traffic when exploiting this mess.