Sorry, my bad, there are no boost pads in the trailer, but it would be silly not to add them, as it encouraged tactful driving by choosing certain paths and encouraged players to go on the walls and roof.
At least in the trailer, there is a visual effect on your vision when you boost, but i'm not sure about flames at the front of the car. Seems unnecessary, as the cars never actually enter speeds in which that would happen. The Rollcage cars generally cap around 700kph (435mph). The speed of sound is 1,225kph (760mph), so they are no where near close.
I much prefer the impact boost has on your vision, as seen in the Trailer. It gives a greater sense of speed and excitement, as it impacts your entire view in a subtle way.
KazzyMac, what are you even on about?