First, make sure you've got the sound folder for the ISI BMW F1 car in that install, in case you used a rFLite install. That folder, named FBMW Engine, goes in the Sound folder. If you're using a full rF install, disregard.
Then, put the .sfx file that Darren made in Vehicles/IndyCarSeries/2009 Season folder, replacing the old Indy.sfx file. Be sure and back that one up in case you want to replace the addon one later.
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Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it."
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Politicians are like dirty diapers. They need to be changed often and for the same reason."
Mark Twain
"I do not suffer from insanity. I enjoy every, single minute of it."