Gary, I love that Montreal video. I'm fairly sure you can even hear Senna's right foot doing the throttle pumping he was renowned for!
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jucksman
Also, these cars usually have a rev limiter to prevent the driver from accidentally blowing it and having to pay 150.000 dolars for a rebuild, and that changes the engine noise a little, too.
This is the reason they don't normally have the original engine.
People like Judd make/made engines especially for cars like this - not anything as powerful as the original, but ones which can do a lot more miles.
As for traction control, I doubt any of these cars have it. I can't believe the owners would have the electronics ability needed to maintain the complex EMSs the cars used. Of course, they wouldn't be complex by modern standards, but it's like programming an old computer game - it's far easier to make a similar game now than it would be then.