There aren't many downsides to this game, but one of the major ones is the lack of wheel support. Personally I think that these types of games are a lot more fun using a racing wheel. So, In order to do this, we have to download a program called AntiMicrox[github.com]. (Newer version of Antimicro which also supports Linux distros)

Wheels I have used and remapped so far:

Logitech G29
Fanatec CSW 2.5/ Clubsport Pedals V3/ Clubsport Steering Wheel Formula V2
CSL Elite Steering Wheel WRC
Fanatec DD2
GSI FPE V1
GSI GT-MAX32
Heusinkveld Ultimate+
It can help if your wheel has a lot of buttons, that translates to more inputs being mapped from your keyboard but Slipstream isn't too complicated, thankfully.

An alternative to Antimicrox is Joy2key which can be used in the same way, but it is a bit messy compared to antimicrox and I use it to remap my 3rd party handbrake device which slipstream doesn't really take advantage of so I decided to exclude it from this guide.

After downloading and opening it for the first time, you are shown all your input devices as tabs.
I'll be using my own screenshots so while it may not be exactly the same, it should give you a good idea of what to do.

You can see from my screenshot that if it is detecting an active input, the text will highlight red, but otherwise it will black.

Once you have a tab selected, you will see a list of every input possible from the controller as well as the ability to save, load, and enter a new configuration. I would recommend you calibrate your device and set the wheel rotation to 360 degrees before you start. Although, it's up to you and your preferences.

D-PAD

Starting from the top, if your wheel has a dpad or analog stick, you can remap them to the keyboard arrow keys which will allow you to navigate menus.




We'll click on the left dpad here:


You can choose any key including mouse buttons, but we'll click on the left arrow key for now and it should look like this:


Wheels are different and some have more inputs than others. If you do not have a dpad, analog stick, or it simply does not find it from antimicrox, then, you could work around it by using other keys on the wheel. However, if you do not have the buttons to spare, you can assign your up and down keys as your pedal inputs (clutch would be most beneficial here) then turning the wheel left or right would register as horizontal inputs along menu items.



Axis Inputs

Next, any inputs with an axis will be shown before your list of buttons. Note: Any active input is highlighted in blue.


Here we can see that it offers some presets, or you can set your own as well. Axis one for me is my wheel but it might be different for you, in this case, we don't touch the type of throttle here.




Acceleration is a bit different, we will have to change from normal in the drop down menu, to negative throttle and likewise for the brakes.

Above the dpad inputs, you can see the buttons to save, load, etc.


When you have a configuration you loaded, it will display the name, otherwise it will default to "new" (every time you open the program too).


You can make changes on the fly as well, and on the bottom, there are sets, which can be applied to different games that may not have wheel support.


Saving is pretty straight forward, once you're done remapping your inputs, you will hit save as which will open a new window, allow you to name your configuration, and choose the location of your save.