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so if you guys don't know how to add afterburner i will give you the step
1. download the universal afterburner already added in gta 5 mods
2. after that, put the files afterburner to script folder gta v (if you dont have yoa can make the folder)
3. change the text afterburner setting
FROM THIS:
;Normal Afterburner: 1
;Rocket Coil Voltic: 2
;Currently only support 2 style
Style = 2

TO THIS

;Normal Afterburner: 1
;Rocket Coil Voltic: 2
;Currently only support 2 style
Style = 1

you can copy this and paste it.

why your mod car dont have the sound bro?