If Angie is the first person for you to beat, listen up. Equip your camaro with the best performance you can get. You don't need to get suspnsion or tire upgrades, I didnt. At the start of the race, gun your engine and push against Angie. Push her against the wall and hold her their. When you get to the second shortcut of the race, push hard against her so she hits the division between the short cut and the normal track. This should give you a big enough lead on her to beat her. In the canyon, be wary. When it is time to hit a turn, slow down using the L button, not the A button. As soon as you get past the turn, gun your engine. Do this for each turn you go past. Hope this helps.
The best way to beat Darius is in a gallardo, fully equipped with the best performance parts. Also get unlimited nitro and gun your engine the whole way. This is how I beat Darius in street racing. In the canyon, Take it slower. Slow down on the turns using the L button. It helps ALOT.
For those who are seeking for help in completing the callenge in earning the Chevy Chevelle SS; The best Way I found was starting career mode with The CAMARO and fully souping it up.Except for the last upgrade which you unlock by Defeating Angie of 21st street gang. Aim for her ride's Pink slip and then go after kenji but keep in mind that you want to unlock the latest performance upgrades for the Charger R/T after you beat kenji You get Yumi Now after defeating Angie it's best to keep SAMSON as your current wingman for the extra cash alomg with NEVILLE also for the extra cash. Your 3rd wingman (but not current) should be Yumi for her discount in performance parts. Then just cut through everybody else. THE Hardest part would be in taking down virtually all of Silverton in your Charger R/T. Selling all other cars (this way you'll earn the amount of cash needed for completing the HAVE A BALANCE OF 1,000,000$ cash on you in career mode. In order to take down DARIUS I found it easier to do it with A DODGE VIPER (USE the acceleration to your Advantage and brake a little ahead before you reach the corners so you have time to boost out of there.
This is a Heavy challenge for those who think they are up for it. This has been proven, for it took me 5 times(Restarting career mode each time) to reach it after hours of calculations and theories I finally came up with an answer. AND NO CHEATS WERE INVOLVED, JUST HARDCORE RACING AT IT'S VERY BEST.
REPLY IF YOU HAVE ANY QUESTIONS ABOUT THIS POST. AS for me, I'll continue my research for more updates.........
I find the best car to pick at the start is the Alfa Romeo Brera. Wolf is the easiest boss and doing so will unlock you the Porsche Carerra GT later.
The best is easily the Tuners. Handling is extremely important for this point in the game. May I especially advise the Renault Clio V6 Sport. It's very cheap and despite being not that fast on the straights, I personally think it is by far the best handling Tier 2 car.
Now here it depends what you've unlocked before buying. The best Performance wise are the exotics, yet at the start of this area, buy the Tuners. This is because the exotics have the best performance by far at Tier 3, but they're also the most expensive (The cheapest being 150000) and they can only accept Race Performance Packages. Tuners on the other hand are the cheapest (The most expensive being about 90000) and will accept any tier 3 performance upgrade. So, until you have unlocked every race package, buy the Tuner.
When Nikki joins your crew, don't use her for drafting, instead use Colin because his car is way faster and he allows you to draft from a further distance. That will make racing easier also it will allow you to gain more speed.
Alright when you start out the game lets you pick three cars. Pick the Camaro and stick with it untill you unlock the Lotus Elise. Then when you get to Darius' teritory buy the Mecedez Benz SLR McLaren.
Also after you beat angie go beat Kenji not Wolf trust me you unlock more cars that way.