Blur cheat codes:
Enter the following codes for the desired effect.

Go to the Multiplayer Car Showroom, highlight the BMW Concept 1
Series car and enter LT, RT, LT, RT - Chrome BMW.

Go to the Multiplayer Car Showroom, highlight the Bronco and enter
LT, RT, LT, RT - Fully upgrade the Ford Bronco.

Purple Lights:
Destroy 10 street lamps and five benches consecutively you get urban
sprawl achievement and unlock the purple sub lights.