After the TTE turbo issue, I think that the FIA has been looking very closely at rally cars in general. There was a driver who won a round of the ARC, but was diqualified post event for having an illegal modification to the brake booster. The modification that had been made is one that Prodrive has been doing to all it's group N cars, where a solid pipe is inserted into the deactivated brake booster to retain brake pedal feel, and has been used for a number of years, by different teams/manufacturers.
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