How do you unlock tank in burnin rubber 4

hi. i see ya needing some help. if you havent already, unlock the snowpeak stage by i think completing 15 tickets. after unlocking the stage, go to the weapon shop, and if you go up the mountain, you will see a ramp. after jumping it, you will see the snowpeak boss ticket. after collecting it, go to the ticket office where you select the race to do. on the left bottom corner, you`ll see four squares for the boss ticket. click the left bottom with the crystles and then the boss battle starts. after defeating the tank boss, you unlock the tank. then, go to the safe house and then choose the tank. go to the tune shop to upgrade it, go to the weapon shop for a better weapon.