Score a Burnout Chain of x4

复制下psnp看到的tips：
To be able to go for this trophy, you will first need to be in a Speed Type vehicle. These are the only types of vehicles that allow Burnout Chains to happen. These vehicles will only allow you to boost if you have its boost meter filled up completely. Once you have it completely filled up, then you can start boosting. To start a chain, you will need to deplete the boost bar WITHOUT letting off of Cross（X键） or crashing. If done correctly, then you will notice that you have an x2 chain.

You will need to keep this up until you get to x4. One tip to give is to find a fairly straight stretch of road to reduce the chance of crashing while trying to make turns. Once you reach an x4 chain, then you will be awarded this trophy.

选择Speed（黄色圆圈）类型的车，找个长直路（推荐地图最下面），满氮气逆行状态全程按住X加速不放，氮气消耗完会立刻加满并且显示x N ，不撞车的情况下达到x4即可。