They will be banned next year but in the meantime, development of the T-wing is booming with Red Bull the most recent team to resort to the now ubiquitous aero device.
As it seeks to reduce the performance gap with front runners Ferrari and Mercedes, the Milton Keynes-based outfit is pulling out a few stops on the development front.
It's Spanish Grand Prix update package appeared to improve the efficiency of its RB13, and the team has pursued its efforts for Monaco.
While a pit stop blunder was the only thing that kept Daniel Ricciardo from winning in the Principality in 2016, it may be a different story this year, with designer Adrian Newey doubting a race win is in the cards despite the team's improved performance.
"Last year we had a good chassis," Red Bull's part-time technical boss Newey told Brazil's Glob.
"So at Monaco, where you rely less on the engine, we could shine.
"But this year we do not have the best chassis, so we will not have the same opportunity as last year," he added.
"I think we have to improve between now and Singapore, and use that as our next chance," said Newey.
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