This mod makes iKX3 Mods’ Pagani Utopia behave more realistically, in terms of acceleration, top speed and driving in general.
It also contains extra files that can serve for an even more realistic driving feel, which can be used by having these mods here:
Custom Torque Map: https://it.gta5-mods.com/scripts/custom-torque-map
Custom Gear Ratio: https://it.gta5-mods.com/scripts/custom-gear-ratios
And last but not least, for making your car drive even more realistically, especially when it comes shifting gears if you want to have control over that, I suggest you to use this mod:
NOTE: The cars you see in the showcase videos have been driven without traction control to show their full potential, hence why you (could) see them spin and/or drift at some point. To avoid that your can could spin unexpectedly, you would need to install Manual Transmission plugin by IKT (you can see the link of it above with other suggested mods), navigate the plugin settings and turn on traction control (TCS).
Have a nice day!