With all that cold air whizzing through the engine bay as you hammer it along?
Heat soak will have an effect but it's not going to be huge unless you're sat still like on a set of rollers. All the modern Lambo's run a dual Airbox setup, with the Airbox being directly above the Cats at the rear of the engine bay. Ferrari's setup on the mid-engined cars isn't too different either and on every rear-engined Porsche since the dawn of time, the Airbox sits directly above the engine...