Fast Racing For Fast Profit:

Start out with any vehicle you like. When you make enough money to make your vehicle faster using the beginner hall, move over the the special conditions Hall. Defeat the first race (Rally d' Umbria) and you will receive a Cadillac CIEN '02. Get more money and put more power into your Cadillac CIEN '02 (you won't have to if you don't want to). The CIEN will gain almost 1000+ HP. Go to the second race with the CEIN in the Special Conditions Hall called Rally d' Capri. After you win that race you will get a Toyota RSC Rally Raid Car '02 which you can sell for more than $230,000+. Keep racing that race and keep making the money.

To obtain over 260,000 credits easily just take your best car and take it into the Rally d' Capri easy in the Special Conditions hall. Once you obtain the car sell it and you get over 260,000 credits. You can repeat this over and over and soon enough you should be able to afford anything you want.

Enter the European Hall event 1000 Miles! I recommend either the Ginetta G4 '64 (won from Beginner Lightweight K Cup) or the Chevelle SS 454 '70 (won from American Muscle Car Championship). Enter the Cote d'Azur race (I think the last one works just the same). Make sure your car's HP is near or above 200. Put it on B-spec, 5-Push, overtake, 3x speed. Come back after a couple hours (this works best if you leave it overnight). You should have won the race, along with 150,000 credits! This can also be done with the championship race, which is 4 races. 4 races times 150,000 credits plus 300,000 credit prize equals 900,000 credits. The prize car is crappy, but who cares, you have 900,000 credits from doing nothing!