Found this HERE
Things needed that you probably already have:
-Xbox 360 Console
-Forza Motorsport 2 game disk
-Xbox Live Gold service
3 things needed that you may not have yet:
-Xbox 360 memory card (use the CC coupon and get one for $10.00 total at Circuit City if you don't own one already)
-Transfer kit made by Datel (includes the Xchange360 software required) - can be purchased at most local video game retailers. Circuit City has them for $14.99, cheap.
-48 hour free trail card (to prevent you from getting banned from xbox live, Forza 2 comes with a free 48 hour XBL trial card, check the box) OR when making the second account, you might even be able to do a free 30 days xbox live gold trial, try that first! While you're making your secondary XBL Gold account, don't input any code and it may allow you a 30 day free xbox live gold trial!
Ok, there is a very simple way to do this, and a slightly more complicated way. First I will explain the easiest way which involves the simple duping trick.
1. With your main Xbox live gold account, you can gift very expensive cars to your secondary account (which must also have Gold live access).
2. After you have gifted the cars, log onto your second account, creating a save using the mem stick, and download the cars into career mode. If for some reason you don't see the cars right away, restart your 360 and then log into the second account. Every car you gifted should be there to download once you go to the multiplayer tab. A message should pop up about a "new car gift".
3. Now here's the big trick, once you have all of those cars downloaded on your secondary account, you can take the mem stick out, back up the save (with the Datel Transfer Kit) and then you will have those cars forever! What does that mean? It means every time you load up that save with your second account, you still have those same cars no matter what. Same thing with any amount of CR you have in that account. It'll always keep coming back every time you reload that save from your PC.
4. Regift those same cars back to your first account AS MANY TIMES AS YOU WANT!
5. Log onto your main account, download the cars, and sell them in career mode over and over and over. No limit!
6. RINSE AND REPEAT AS MANY TIMES AS YOU WANT!
That is the best way to get unlimited CR in Forza 2. Also, all of your current CR will remain the same as it was when you saved it with the gifted cars you just downloaded. It's super easy stuff, although it can be time consuming.
Now here is the second way using the auction house:
Unlimited CR Auction House style:
Step 1> Create a game save on the memory card with a new xbox live gold account created with a 48 hour free trial. The 48 hour trial account may get banned from xbox live eventually (usually only for 1 or 2 weeks, but you wont even be using that account to play Forza 2), but this will prevent your "good" account from getting banned.
Step 2> On your good account, gift a couple of cars to the other account. You will have to send it a friend request.
Step 3> On the 48 hour account, put these cars up for auction for the max amount that you have in your other account. Example, if you have 98,000 dollars on your good acount, put them up for a buyout of 95,000. I recommend NOT going over 950,000 though.
Step 4> Switch to your good acount and buy the cars from the 48 hour account. This will take all your money out of your good account temporarily.
Step 5> Back up the game save from the 48 hour account on the memory card, to the pc using the software included with the transfer kit. SUPER SIMPLE!
Step 6> On your Good account, put up several "cheap" cars for the amount in the other account.
Step 7> Put the memory card back in the 360 and boot up the 48 hour account. Go find your cars from the good account in the Auction House. Buy the auction, then re-download the gamesave on the memory card FROM the PC using you Datel Transfer Kit, and continue to do this until all the cars have been purchased.
Step 8> If you did this 10 times with 95,000, you should now be at almost a million. You then can repeat the process using a million dollars. Rinse and repeat as many times as you want!
Notes: The max buyout for an auction is 10,000,000 CR. You can really spead up the process if you can get someone to go in on a bidding war with you to help you out. Once you get the auction up to like 50 million, every time you get outbid, you can receive your money, back up the card, then bid again. Then put the save back on the memory card, and go bid again. That will get you a billion dollars very quickly. Make sure you use your secondary account to make the mass amount of money, and only transfer money needed to your good account via the Auction house.
You can win any car in the AH, using the 48 hour account, then gift it to your good acount as many times as you wish.
If you have very little funds in you good account when doing this, you can purchase a car, gift it to the 48 hour account, then use the car dupe trick below.
To constantly gift the same car to your good account, then you can just sell all the duped cars to make some cash (as explained up above originally).
Duping cars:
Any cars on the memory card when you save it to the PC, will still be there even if you gift them to someone, or sell them in the AH. Just redownload the save to the memory card after you have sold or gifted the car. As explained above.
