Pagani Zonda Sound v1.0

Can you help me? I have a issue with this mod. I used Alci's Saat Gui Fronted for installing this mod. When i join the game, the sound works fine but when i get out from the car and start walking around the city, i hear the pagani sound when cj touch the ground with his feet. Sorry for my bad english, i'm italian but i hope you can help me with this problem.

On my computer i don't have any problems but on my other pc i have the same problem, so i think the problem comes from the sound card or no idea...

hi could you make a supercharger sound of this video please?

http://www.youtube.com/watch?v=rw6YYEEO3J0

sound starts at the first seconds, just cut the sound from 01 to 04 seconds please man i love supercharger sound :)