I'm reminded of my trip to Le Mans a few weeks back, sitting in a traffic jam of rare and powerful exotica. We've got the GTA Spano in front - and as it screams off the line, we edge forward for our turn.
The marshall's hand comes down; just a few seconds to go. Rene builds the revs and the V6 shouts its reply behind us. Up goes the Marshall's hand, and we jump from the line.
First gear lasts only a few moments before we're into second and tearing up the first straight. Rene's keeping a keen eye on the state of all the car's internal sensors thanks to the in-built digital dashboard. Crowds line every inch of this iconic course, and I spot several hundred camera flashes as we go by.
Past Goodwood House and we're very nearly into triple digits. The Twin'Run just keeps going, and Rene shows no sign of lifting his foot from the accelerator. Under the main gantry and I spot the 300ft warning board for the hillclimb's main, and toughest, left-hander. We go past it at full pelt. I get nervous.
The 200ft board goes past in a similarly brisk fashion. I tense up.
As the 100ft warning board hoves into view, I wonder if I should say something to Rene, but then we finally brake and I get the full benefit of the Twin'Run's four racing-spec disc brakes.
We make the turn, and I spot one of Goodwood's large TV screens ahead. The Twizy F1 concept that was behind us in the paddock has set off and is showing crowds the full benefit of its KERS package.
The course tightens near the end and the crowds thin as we get closer to the finish line. Rene doesn't brake into corners until the very last moment, and it's clear he knows this course like the back of his racing helmet. Me? I'm just trying to cling on.
The finish line comes up ahead and, like a bull toward a red flag, Rene gives the Twin'Run one last chance to shine. It does, and we cross the line.
We pull into the holding area at the end of the course with the other cars, and a good portion of heads turn our way, having watched the Renault's progress on the big screen.
There are several nods of approval from other drivers as Rene switches off the engine and steps from the car. He's pleased with it, then, and that's good enough for me.