Hello! Making these adjustments wasn't originally in my plans, but now it's done. The updates are primarily for enhancing acceleration, power, and partly for the suspension -- I've modified the power with which the car lowers.

Required:
OpenIV


Bugs: none at the moment.

Installation of handling:
Run OpenIV
Navigate to mods > update > x64 > dlcpacks > fk8 > dlc.rpf > data
Drag the handling.meta in it


Installation of gear ratio:
You must install the CustomGearRatio mod
Navigate to your main GTA folder > CustomGearRatios > Configs
Drag the xml file to the Configs folder


Mods mentioned/used:
https://www.gta5-mods.com/scripts/custom-gear-ratios
https://www.gta5-mods.com/vehicles/2018-honda-civic-type-r-fk8 (this configuration is specifically for this one)

High recommended to install (optional):
https://www.gta5-mods.com/scripts/manual-transmission-ikt
https://www.gta5-mods.com/scripts/true-realistic-driving-v-realistic-mass-v0-1-beta

Special thanks to:
ikt - for the Manual Transmission, Real Time Handling Editor, Custom Gear Ratio mods
Los Santos Import - For the car mod, initial handling file