ere are some codes just type them while playing...

BF injection: Get first place at the dirt ring race at las venturas stadium

Bloodring Banger: Get your total time up to 1 minute in the Bloodring

Bullet: Get all silver awards in driving school

Dune: Beat the score of 25 at the Dirt Ring

FCR-900: Get all silver awards in bike school

Freeway: Get all bronze awards in bike school

HotKnife: Get all gold awards in driving school

Hotring Racer: Get first place in 8 - Track

Hunter: Get all gold awards in pilot school to spawn one at Verdant Meadows Airstrip

Hydra: Beat the mission, "Vertical Bird" and it will spawn at your airstrip

JetPack: Complete the airstrip asset near Las Venturas

JetMax: Get all gold awards in boat school

Marquis: Get all bronze awards in boat school

Monster Car: Win it by beating 8-track

NRG-500: Get all gold awards at Bike School

Rustler: Get all bronze awards in pilot school

Squallo: Get all silver awards in boat school

StuntPlane: Get all silver awards in pilot school

SuperGT: Get all bronze awards in driving school