.veh modding troubles

I have downloaded the great f1 Classic 1991 mod which does a good job to replicate the 1991 lineup of cars in the Formula Classic body style, but I have found a problem. All of the cars still use the turbo V6 engine sounds, when in 1991, v6's were phased out in favor for naturally aspirated V8/V10/V12 Engines.

I wanted to change the Ferrari and the McLaren to use the Formula V12 sounds to mirror the real life cars somewhat better, but when I change the sound in the .veh file to the path specified in the Formula V12 .veh files, the car disappears from the menu selection when I start the game back up. Is there something I'm missing?

Also what does it mean when It is referring to a .sfx file like in rFactor? I can't find any .sfx files in the specific car folders like in rF except for default.sfx in the general vehicles directory.
 
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