Add sounds to new cars in SHAR

do someone know how to do this? with RCF Explorer or other program?
Example : i have a new vehicle (Ferrari) and i want to add the sounds of 70's Homer Car or Bart's Ferrini, how to?

MERGE:
Help please D:
I Edited the Car_tune.spt , but how to put my mod ? I Dont renember.

If you need to put your mod into the Lucas Launcher you need to create a meta.ini file in the root folder of your Mod
If you don't remember how to do it see the Guide to Meta.ini on the tutorials board.

Try placing the sound script you've edited into CustomFiles/sound/scripts. That should work and allow you to edit the Ferrini's sounds (which I assume is what you're using as a base to create the Ferrari).

with sound/scripts/cartune.spt , the game crashes, but if i remove it , the game Works perfectly
what happens?
Link of my CustomFiles

MERGE:
Help please D:

DOUBLE MERGE:
Whats wrong with my file?

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