The Japanese championship’s organiser JRP revealed at last month’s Autopolis round that it planned to conduct the experiment by modifying the exhaust layout of its current four-cylinder turbo engine to create a noise reminiscent of the series’ former V8 machines.
Following Sunday’s Sugo race, the Toyota-powered development car driven by Hiroaki Ishiura - the so-called ‘Red Tiger’ - was fitted with the new exhaust for the post-race test.
