If Christian Horner were in charge of Formula One he'd bring back high-revving V12 engines, but the Red Bull team boss doubts the sport's decision makers will agree with his vision for F1's future.
The sport's last major engine regulation change came in 2014, when it ditched naturally-aspirated V8s for a fuel-efficiency formula based around V6 turbo hybrids. Last year, those regulations were locked in place until 2020 by an agreement between teams and the FIA aimed at achieving greater performance convergence while lowering costs over the coming seasons.
However, after 2020 all options are open again and the FIA and Formula One Management have been meeting with car and engine manufacturers this year to determine a new set of power unit regulations for 2021.