Again, while GoPro historically, has had a few artifact related issues, this isn't something unique to them, when used in cars like Westfields. Many of the "Action Camera" models are going to have the same issue - coupled with, in a Westfield, the best place to record the sound from, to get good balance between exhaust and intake noise, is not the best place to video from!
Action cameras were essentially designed to be strapped to a person doing (sometimes) extreme sport type activities, and only had to capture a bit of background sound for effect plus any dialogue/screams of terror etc from the person wearing the camera. While windsocks are often available for the cameras, again, they weren't really, generally designed for the speeds a Westfield may be doing on track.
But, with a few tweaks, like external mic's etc, decent results are possible - don't compare yourself to what you'd see and hear on the big screen though, or it's easy to disappear down a rabbit hole trying to pursue similar quality levels!!