These mods are intended for the 1998 version of Sonic R. Given that the Sonic
R Updater is now a thing, you probably aren't using that version, so these
aren't super helpful. These are in LunarIPS format.

SONICR_CPU.IPS - Fixes the crash that occurs on startup. You'll still need
                 D3DWindower to have controls, or you could use WINE on Linux.
SONICR_CD.IPS  - Bypass the CD check. I found this in a pirated copy in the
                 description of a shady YouTube video, but it works, so :/
                 (I was trying to gather every unique copy of Sonic R I could
                 find.)
noblink.ips    - Disable character blinking, so that custom models don't have
                 random eyelid textures placed in the wrong location.
slopefix.ips   - See https://invisibleup.com/articles/6/. I don't know if
                 this actually does anything, tbh.