[Nebula]

Update: Added 2 nice addons.

[Kvatch]

If I wanted to find different sounds for garrys mod that can alter let's say every sound in the game and completely customise my game, are there any sites that feature this kind of stuff? Or what would I search for on the workshop for this?

[Quest]

If I wanted to find different sounds for garrys mod that can alter let's say every sound in the game and completely customise my game, are there any sites that feature this kind of stuff? Or what would I search for on the workshop for this?

There may be a way to change source engine sounds.

[Nebula]

If I wanted to find different sounds for garrys mod that can alter let's say every sound in the game and completely customise my game, are there any sites that feature this kind of stuff? Or what would I search for on the workshop for this?

Luckily, i've found the perfect mod for it too, it changes (almost) every sound. (Most of them work but not all work properly but the most work. Also it replaces the lockdown sound with a nice and not too loud warning siren)w
I recommend subscribing to all addons.

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And if you're tired of some old rusty props, here you go (they are client-side so they work in mp)

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[Quest]

What are your settings?
I don't get reflections on any cars?

[Nebula]

[Quest]

[Vimpto]

The way I've changed all of my vehicle engines sounds to something I like is a long process but is as follows:

Find the car addon you want to edit in C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\addons

for example LW Bentley Continental GT
Drag it onto your desktop with Garry's Mod Closed. 
Then go to C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\bin and drag the .gma into on top of 'gmad.exe'. This will convert the GMA into a folder. You find it on your desktop and open it. Go into the 'Scripts' folder then 'Vehicles' '<Car Addon Name>'. Then select the <carname>.txt. You want to edit

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this bit.
For example change this 

to this


Then put the folder into C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\addons

The process is long and boring but I enjoy it for some reason.

For anyone wondering how to change car sounds ^^