Williams has impressed F1's eagle-eyed technical experts with an innovation aboard its new FW35.
Although designer Mike Coughlan's Coanda exhaust solution will have to be removed from the 2013 car, respected German correspondent Michael Schmidt reports on Friday that a clever brake duct solution is fully legal.
The British team probably got the idea from Red Bull, who were ordered by the FIA to remove a similar solution from the title-winning RB8 last year.
The governing body ruled that Red Bull was using the brake ducts as an aerodynamic aid, by channeling airflow through the wheel with the rim, hub and nut all playing a role.
But Auto Motor und Sport's Schmdit said Williams' version is legal, crucially because the exit holes for the airflow are stationary, meaning the layout cannot be deemed a banned moveable aerodynamic device.