I would have never listened to a car show guy/non racer's advice on anything car related. Not Anything. Nor would I have ever picked up a magazine written by the same type. So expensive to UN-learn.
Non-racers. Who endlessly brag about their car, friend's cars, and cars they don't even own...but everything you own is crap.
If they go to a race they never participate, only spectate...but they come to my pit area (usually when I'm busy) and tell me what I'm doing wrong.
They all have 9, 10 and 11 second cars that you never see at the track but they still get faster every year. And if you ask to see a timeslip they "lost" it.
I think I've met those people also at the races 
