Burnout Legends cheats and cheat codes for Nintendo DS

Unlock compact series extras:
To unlock these bonus cars, you have to do the following:

Unlock Assassin Compact car: Reach 15 takedowns
Unlock Compact Cop car: Earn Bronze medal at Silver lake or Airport T1/T2 Purs.
Unlock Dominator Compact car: Reach 10000 Burnout points
Unlock Gangster Legend car: Earn the Gold medal in Palma Bay Legend Face-Off
Unlock Legend compact car: Earn the Gold medal in Interstate Loop Legend Face-Off
Unlock Compact Collector car: Earn the Gold medal in Silver Lake Eliminator
Unlock Tuned Compact car: Earn 5 Gold medals

Unlock extra muscle cars:
To unlock these bonus cars, you have to do the following:

Unlock Assassin Muscle car: Reach 30 Takedowns
Unlock Classic Legend car: Earn Gold medal in Big Sure Shore Legend Face-Off
Unlock Dominator Muscle car: Reach 25000 Burnout points
Unlock Legend J-Muscle car: Earn the Gold medal in Airport 1 & 2 Legend FaceOff
Unlock Muscle Cop car: Earn the Bronze medal in Harbor Town or Sunrise Valley P.
Unlock Muscle Collector car: Earn the Gold medal in Harbor Town Eliminator
Unlock Tuned Muscle car: Earn 20 Gold medals

Unlock extra coupe cars:
To unlock these bonus cars, you have to do the following:

Unlock Assassin Coupe car: Get 60 Takedowns.
Unlock Coupe Cop car: Earn Gold medal in Vineyard or Palm Bay Pursuit.
Unlock Custom Coupe car: Earn Gold medal in Riviera Race.
Unlock Dominator Coupe car: Get 40000 Burnout points.
Unlock DX Coupe car: Earn Gold medal in Big Surf Shores Eliminator.
Unlock Legend Pickup car: Earn Gold medal in Vineyard Legend Face-Off.
Unlock Legend Special car: Earn 41 Gold medals.
Unlock Legend SUV car: Earn Gold medal in Airport Legend Face-Off.
Unlock Modified Coupe car: Earn Gold medal in Silver Lake Race.

Unlock extra heavyweight cars:
To unlock these bonus cars, you have to do the following:

Heavy Pick-Up - Earn $1,000,000 in crash mode
4WD Racer - Earn $2,000,000 in crash mode
SUV Deluxe - Earn $5,000,000 in crash mode
4WD Heavy-Duty - Earn $10,000,000 in crash mode
B-Team Van - Earn $15,000,000 in crash mode
Delivery Truck - Earn $20,000,000 in crash mode
Tractor Cab - Earn $30,000,000 in crash mode
Longnose Cab - Earn $50,000,000in crash mode
City Bus - Earn $70,000,000 in crash mode
Trash Truck - Earn $90,000,000 in crash mode

Cop Racer: Earn Gold medal in every Pursuit events
Firetruck: Earn Gold medal in every Crash events
Gangster Boss: Earn Gold medal in every Race events

Enable Mirror mode in Single Event
Unlock all Legend Face-Off cars

Get boost in the begging of a crash:
when you hear the countdown to "3, 2, 1": press Square, Square
when you hear "1": press X
When you hear "Go" you will start with a big boost.