After transferring your licenses and credits from Gran Turismo 3, buy the Dodge Viper GTS and soupe it up. Then, go to the Special Event races and compete in the Capri Rally Easy. After you win both races, you are awarded with a rally car worth 236,000 credits. Go back to the Capri Rally and compete in it again. You will be given the Same Rally Car. Sell one, and you will have 236,000 credits. Additionally, buy a decent car like an Evolution (must be of Japanese make) and upgrade it as much as possible. Then, go to Japan and compete in the All Japan race. Each gold awards you 7,500 credits (five races), and all golds gives you 35,000 credits. You will win a 350Z race car at the end. Then, compete in the All Japan race repeatedly. Each time you get all golds, you will get another 350Z that can be sold for over 318,000 credits.

After transferring your licenses and credits from Gran Turismo 3, buy a Dodge Viper or any other fast car. Win the first special race. You should obtain the Cadillac Cien. Use this car to win the second special race. You should be awarded with a rally car worth 236,000 credits. Sell this car and keep repeating this process for easy credits.

After transferring your licenses and credits from Gran Turismo 3, buy a Dodge Viper and equip it with a Racing Chip and Engine Balancing. Then, go to the Special Conditions events and enter the Capri Ralley. You should be able to easily win with the Viper. Win the rally four times, then buy and sup up a Mercedes Benz SLR Mclaren. Enter the Legend Of The Silver Arrow race to get the Mercedes Benz CLK Touring Car. After tuning the car up, go to the European Events and enter the fourth race in B-spec. After doing this, you will have 150,000 credits in prize money and a car that you can sell for 743,000 credits. If you do the race in race monitor mode, you can press R1 and Right(2) to make the race go by three times as fast.

After transferring your licenses and credits from Gran Turismo 3, buy a Civic Type R (EP or EK). Then, add mods to it to get over 230 hp. Go to the Honda dealer and join the Civic races in the One-Make Races. Finish first in all the race courses and you will be awarded the Mugen MOTUL Civic Si Race '87 Car. Sell it for 90,000 credits. Then, repeat the process again.

After loading your Gran Turismo 3 game credits (110,000 credits) and A and B licenses into your Gran Turismo 4 game save, go to Tuner Village in the lower left hand corner of the main menu. Select HPA Motorsports and buy the VW Golf look-alike, (2004 HPA Motorsports Stage II R32) for 31,870 credits. Exit from the Tuner Village and go to the Special Conditions Events icon. Enter the 2004 HPA Motorsports Stage II R32 into the Cost Di Amalfi race. Do both races forwards and backwards. This should only take about ten minutes with the 2004 HPA Motorsports Stage II R32. When you complete this event you will be rewarded with the 2002 Toyota Rsc Rally Raid Car, which has a selling price of 265,624 credits. Sell the 2002 Toyota RSC Rally Raid Car and enter the Cost Di Amalfi race again with the 2004 HPA Motorsports Stage II R32. You will be asked if you want to "Clear Records" from your previous races. Select "Clear" as your option. Enter the races again. Win both races and you will be rewarded with another 2002 Toyota RSC Rally Raid Car. Keep doing this repeatedly to get as much money as possible in the least amount of time. Within one hour you could have up to 1,650,000 credits. Keep returning here as your credits run out. Also, you will get an extra 10,000 credits for taking first place on both Costa Di Amalfi races. Also, the 2004 HPA Motorsports Stage II R32 can be entered into quite a few races very early in the game, so you do not have to waste your credits buying other cars.

Start a game, then go to the Used Car Showroom 2 and buy a 1997 Civic Type R (ek). Give it more horsepower with the extra money you have, with a racing chip and an oil change. Go to One Make races in Honda. Go to the Type R races when you get your license and keep racing until you get enough money to buy a turbo kit. Then, go back and keep doing this until you have a lot of horsepower. Win all five races and at the end, you will have obtained 25,000 credits and a prize car worth 95,000 credits. You can keep doing this until you get enough to get a 1999 Skyline. Trick it out and go to the Japan races. Race the 90's Series and win all the races. You get a Nissan 350Z. Trick it out and it will have 700 or more horsepower. Then, go to Japan races again. This time go to the Tournament. Do B Mode so you do not have to get the big license and put it on 5+overdrive and press R1. When you are in this mode hold L1 + Right to win all the races. You will get another 350Z. When you trick this one out, it will have over 900 horespower.

Start a game, then go to the License Center and get the International B License. Then, get the best car you have and go to the Special Condition races. Win as many as needed to unlock concept, rare and very expensive cars. You can sell the Toyota Rally Raid car for about 265,000 credits. However you can keep it if desired and race in the dirt and snow events with it. Sell all the cars that you do not need.

Get any car that has about 400 hp and go to the Special Condition Event. Select the second race from the top. Defeat the CPU in both races and you will get a car that can be sold for 260,000 credits. You can also use that car to race in the same event. When prompted to clear the trophies, answer "OK". When you win, you will be awarded the same car.

Get the SLR Mclaren and tune it up. Go to the Mercedes event and win Legends Of The Silver Arrow to get a touring car as an award. Win several of these then sell them at 116,000 credits each. Save one four yourself and enter the Touring Car Championship in the European Events. Win it to get a CLK GTR car worth 743,000 credits.

Win a Chevy Chevelle SS 454 '70 from the American Muscle Car Championship (using a suped up Ford Mustang '05 recommended). Add a stage 2 or 3 engine setup then a supercharger to get 600 to 700 hp. Take it to the Classic Muscle Car championship and race using B-Spec. You can get a fast 10,000 credits because the race is only two laps (Laguna Seca recommended). Repeat this as many times as desired.

Once you win the Cadillac CIEN from the two easy Citta di Aria races, and have acquired the IA License, go to the Normal Tsukuba Circuit Wet race. If you manage to win the race (which should not be too difficult in the CIEN as long as you can handle driving on the wet road), you will earn 10,000 credits and a Mazda6 Touring Car worth over 93,000 credits (if sold).

Get a good rally car. It does not need any special tires. An Evo 8, MR is recommended. Then, go to the Special Conditions Events. Go to the second race in the event, known as the Capri Rally. It is fairly easy, but you need a A-Spec: National License. Once you win both races, you will get a Toyota RSC Rally Raid Car that can be sold for 265,624 crredits. You can then go back into the same race, clear all your records, and win the car again.

Go to Special Condition Events and race in the Capri Rally (easy). If you win, you will get the Toyota RSC Rally Raid Car. You can sell it for 265,624 credits. However, keep that car at first to make it easier to win the same race again.

Do the A and B Licenses. Select the car of your choice and go to Special Conditions. Go to the second one on easy (Capri Rally).Win both of the races and you will be awarded a Toyota RSC Rally Raid Car, which is worth 265,624 credits. Keep one of the cars yourself, clear your records when prompted, and win the Toyota again.

Enter The Vette! Vette! Vette! and do all the races. You will get a race car Corvette that is worth about 106,000 credits. Enter again and clear the races. Win it again and on top of the 50.000 credit prize, you will be awarded the same car again. Repeat this as much as desired.

Buy a Mitsubishi Lancer Evolution and do the standard modifications (flywheel, stage 1 turbo, brakes, etc.). Then, go to the Japanese Manufacturers and race the Mitsubishi Evolution series. All of the tracks are very quick, fairly easy, and pay out 2,000 credits for first place and 1,000 credits for second place. Practice as much as desired for a few extra thousand credits. After you get all Golds, you will be rewarded with the 70's model Lancer that sells for over 30,000 credits.

This trick requires two memory cards. Use the first memory card and buy good car for 10,000 credits or under. Trade the car to the other memory card and buy upgrades for it. Delete the block on the first memory card and restart so that you get 10,000 credits again. Trade it back to memory card one and repeat the process.

This trick requires two memory cards. Save your game onto memory card one. Turn off the game. Then, turn it back on and load the game that was saved on memory card one. Next, save your game onto memory card two. Gain 5,000 credits. To do this, have enough money to by a car with at least 100 hp. Go to Easy and win the Sunday Cup's Super Speedway five times. Winning the race in first place is very easy. Rev the engine, and when it says "Start", do not get in the pack. Instead, stay to the left and you will finish in first in thirty seconds. After making 5,000 credits, sell the car that you raced in the Super Speedway. Buy a Stage 4 Turbo Kit (or the highest one available) for your new car. Save the game onto memory card one. Load the game from memory card two. You will have over 500,000 credits. This trick takes about thirty minutes.

This trick requires some time. Once you can do it, this trick will give you over 890,000 credits in about ten minutes. You must have the IA license and the Mercedes-Benz CLK Touring Car. To get this car, you must acquire or buy any Mercedes-Benz car that will be fast enough to win the Legend of the Silver Arrow competition (go to Germany, then Mercedes-Benz, then One-make races to find the Legend of the Silver Arrow event). Winning the Legend of the Silver Arrow competition will give you the Mercedes-Benz CLK Touring Car. Once you have the Mercedes-Benz CLK Touring Car all the way fixed up to its maximum and the IA license, you are ready to start the trick. Enter the Deutsche Touring Car Meisterschaft Series race in the European Events. There are five races in this competition: Opera Paris, Mid-Field Raceway, High-Speed Ring Reverse, Nurburgring Nordschieife, and Fuji Speedway. You will not be doing any of the racing yourself, as you will instead use the B-spec Director's Mode on all five races. When you are ready to start the first race in the series, activate B-Spec Director's Mode. The race will now begin, and you will see the numbers one through five at the top of the screen. Press D-pad Right(2) so that it is highlighting the number "5", which signifies "Push" (the car will go as fast as it can). Once "5" is highlighted, press Triangle to put the car in overtake mode. Now that "5" and the little symbol next that number at the top of the screen are both highlighted, you are all set. Press R1 so that you are in Monitor Mode. While in Monitor Mode, hold L1 and press D-pad Right(2) so that the race will go by three times as fast. Do the same exact thing for all five races. It should take about ten minutes for all five races because you are in B-Spec mode. You should finish in first place always if done correctly. After all five races you will have 75,000 credits for being first place, plus an additional 75,000 credits for being the overall champion of the series event. On top of those 150,000 credits, you will also be rewarded the Mercedes CLK-GTR Race Car, which you can sell for about 743,000 credits.