You can run Radiance V, Realistic Radiance, or try out Jeff Favignano's Custom Visualsettings.dat that's in all of his LSPDFR videos.. It's what I use, cause it works with Visual V... Also make sure your post FX are on High or above.
If you're getting FPS drops and random crashes, my best advice to you is to clean out your LSPDFR plugins, and start over installing those, see if that helps.
If you don't mind just having the Tornado Engine Sound for just you, you can use this Trainer https://www.gta5-mods.com/scripts/pc-trainer-v-official . It allows you to change the sound of any vehicle you are in.
The latest version of GTA 5 is what you need, everything is updated for it. Run the installer for LSPDFR first, and then download and install the latest ragepluginhook and scripthook.
Nice! I like it, if you need anymore recordings of radio sounds let me know, I'd gladly record any sounds you're looking for, if I have the radio or means to do so.