Clutches and car revving

[Goro]

I Guess it would be a good idea...but it would be a pain in the ass if you consider GTA SA limitations

This.
In my opinion, the only thing about revving NFS:SA staff could do is actually "revving in first gear", meaning they'd take the sound when you speed up from first gear, and place it when you actually do so. Dunno if you get me, I don't even know if THIS could be possible at all.