While we believe there are no tap in cheat codes for this game, you may find the following list of unlocks useful...
Unlocking cars
Choose your favorite track in world tour mode and race it repeatedly (do not retry). Continue, then repeat.
Assassin Compact Car
Get 15 Takedowns to unlock the Assassin Compact Car.
Assassin Muscle Car
Get 30 Takedowns to unlock the Assassin Muscle Car.
Assassin Coupe Car
Get 60 Takedowns to unlock the Assassin Coupe Car.
Assassin Sports Car
Get 100 Takedowns to unlock the Assassin Sports Car.
Assassin Super Car
Get 150 Takedowns to unlock the Assassin Super Car.
Classic Hotrod
Get a "Gold Medal" rank in all special events to unlock the Classic Hotrod.
Custom Compact Car
Get 10,000 Burnout points in world tour mode to unlock the Custom Compact Car.
Custom Coupe Car
Get 50,000 Burnout points in world tour mode to unlock the Custom Coupe Car.
Custom Muscle Car
Get 25,000 Burnout points in world tour mode to unlock the Custom Muscle Car.
Custom Sports Car
Get 100,000 Burnout points in world tour mode to unlock the Custom Sports Car.
Custom Super Car
Get 200,000 Burnout points in world tour mode to unlock the Custom Super Car.
Compact DX Car
Get 4 Gold Medals in world tour mode to unlock the Compact DX Car.
Muscle DX Car
Get 10 Gold Medals in world tour mode to unlock the Muscle DX Car.
Coupe DX Car
Get 18 gold medals in world tour mode to unlock the Coupe DX Car.
Sports DX Car
Get 25 Gold Medals in world tour mode to unlock the Sports DX Car.
Super DX Car
Get 32 Gold Medals in world tour mode to unlock the Super DX Car.
Muscle Types 1, 2, and 3
Win a Gold Medal in the Silver Lake Compact Grand Prix to unlock the Muscle Types 1, 2, and 3.
Coupe Types 1, 2, and 3
Win a Gold Medal in the Waterfront Muscle Grand Prix to unlock the Coupe Types 1, 2, and 3.
Sports Types 1, 2, and 3
Win a Gold Medal in the Vineyard Coupe Grand Prix to unlock the Sports Types 1, 2, and 3.
Tuned Compact
Win a Gold Medal in Downtown Race 1 to unlock the Tuned Compact.
Tuned Coupe
Win a Gold Medal in the Vineyard Face-Off to unlock the Tuned Coupe.
Tuned Muscle
Win a Gold Medal in the Kings Of The Road Race to unlock the Tuned Muscle.
Tuned Sports
Win a Gold Medal in the Continental Run Race 2 to unlock the Tuned Sports.
Tuned Super
Win a Gold Medal in the Island Paradise Face-Off to unlock the Tuned Super.
Modified Compact
Win a Gold Medal in the Waterfront Face-Off to unlock the Modified Compact.
Modified Muscle
Win a Gold Medal in the Mountain Parkway Face-Off 1 to unlock the Modified Muscle.
Modified Coupe
Win a Gold Medal in the Alpine Race to unlock the Modified Coupe.
Modified Sports
Win a Gold Medal in the Continental Run Face-Off 2 to unlock the Modified Sports.
Modified Super
Win a Gold Medal in the Golden City Face-Off to unlock the Modified Super.
Compact Prototype
Win a Gold Medal in the Lakeside Getaway Face-Off 1 to unlock the Compact Prototype.
Muscle Prototype
Win a Gold Medal in the Mountain Parkway Face-Off 2 to unlock the Muscle Prototype.
Coupe Prototype
Win a Gold Medal in the Continental Run Face-Off 1 to unlock the Coupe Prototype.
Sports Prototype
Win a Gold Medal in the Frozen Peak Face-Off 2 to unlock the Sports Prototype.
Super Prototype
Win a Gold Medal in the Gold Medal GP to unlock the Sports Prototype.
Dominator Compact
Win a Gold Medal in the Kings Of The Road Face-Off to unlock the Dominator Compact.
Dominator Muscle
Win a Gold Medal in the Lakeside Getaway Face-Off 2 to unlock the Dominator Muscle.
Dominator Coupe
Win a Gold Medal in the Frozen Peak Face-Off 1 to unlock the Dominator Coupe.
Dominator Sports
Win a Gold Medal in the Alpine Face-Off to unlock the Dominator Sports.
Dominator Super
Win a Gold Medal in the Dockside Face-Off to unlock the Dominator Super.
Heavy Pickup
Get $1 million in world tour mode to unlock the Heavy Pickup.
4WD Racer
Get $2 million in world tour mode to unlock the 4WD Racer.
SUV Deluxe
Get $5 million Cin world tour mode to unlock the SUV Deluxe.
4WD Heavy Duty
Get $10 million in world tour mode to unlock the 4WD Heavy Duty.
B-Team Van
Get $15 million in world tour mode to unlock the B-Team Van.
INT Express Delivery Truck
Get $20 million in world tour mode to unlock the INT Express Delivery Truck.
Tractor Cab
Get $30 million in world tour mode to unlock the Tractor Cab.
Longnose Cab
Get $50 million in world tour mode to unlock the Longnose Cab.
City Bus
Get $70 million in world tour mode to unlock the City Bus.
Trash Truck
Get $90 million in world tour mode to unlock the Trash Truck.
Fire Truck
Unlock all crash headlines in world tour mode to unlock the Fire Truck.
Classic Hotrod
Unlock all special event postcards to unlock the Classic Hotrod.
Euro-Circuit Racer
Unlock all takedown trophies to unlock the Euro-Circuit Racer.
Custom Coupe Ultimate
Win a Gold Medal in all crash events to unlock the Custom Coupe Ultimate.
Oval Racer Special
Unlock all signature takedowns to unlock the Oval Racer Special.
U.S. Circuit Racer
Win a Gold Medal in Super GP to unlock the U.S. Circuit Racer.