As the game is right now, I would leave them in personally, simply because of the speed of the game. Without them, and the game still moving AS IS, I would think would be too slow for pure pulse, or HD. However, if it were possible, I would like it replaced with a turbo button like Wo3, BUT still including all the weapons the game still currently has, including turbos. This way, YOU are the one to choose when and if you are going to risk your energy at any point on the track, rather than having to wait to perform a barrel roll on the slightest bump, then having to perform a street fighter move. I would hate this feature in an older version of the game, but in the 3 newer ones, it works, but with the other possibilities ranging from a turbo button, to just a faster speed class, I would rather have that. (IF that made any sense ). regardless of what alot of people think about the barrel roll, it is highly unlikely that this feature will be removed due to all of the high praise from the media for a future version of the game anyway, so it's either play this, or go back to XL. This is not a bash on HD for me though, I really like it, and wish I had more time to play. The physics for me are a huge improvement over pulse and pure with better pitch control than both, and getting some of the bouncy movement back that pulse did away with.

Sideshift for me, is a very serious change in the game however. I found myself going around a gradual turn without the need for airbraking at all, but found making the turn to be faster using the sideshift, which almost acts like a mini turbo when used correctly. I think it should be faster to make the turn with regular steering under this scenario. And the sideshift just makes the game somewhat choppy on the turns, kinda like fzero (yes I know there is no swearing here).