Installation:

1. copy jester3c folder to:
X:\Grand Theft Auto V\update\x64\dlcpacks 

2. Use OpenIV go to:
X:\Grand Theft Auto V\update\update.rpf\common\data\dlclist.xml 
right click edit, add new line

<Item>dlcpacks:/jester3c/</Item>

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Change the handling
Choose a handling file from the different handlings folder then

Open OpenIV and copy Handling.meta to:

GTAV/mods/update/x64/dlcpacks/jester3c/dlc.rpf/common/data

and paste it there replacing the old handling

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Engine Sound

If the engine sound doesnt work for open OpenIV and go to 

GTAV/mods/update/x64/dlcpacks/jester3c/dlc.rpf/common/data/levels/gta5

then edit vehicles.meta and change this line of text from this---> <audioNameHash>JESTERMK4</audioNameHash> 

to this---> <audioNameHash>JESTER3</audioNameHash>