Not sure if this is widely known but everyone I ask doesn't know about this at all. So basically all you have to do is spam the boost button on your sparrow to make it go fast as hell. All you have to do is pull the left trigger as fast as you can and you'll see what I'm talking about. This does use boost so be aware. Doing this on a time breaker/ grave robber is a little different. It's the same idea as stated above but you have to hold the right trigger while doing it to get max speed. Doing this make the time breaker/ grave robber the fastest sparrows in the game... By a lot. Go try it out.