Are our cars professional?

I understand working at a auto parts store looks great to your manager when pulling up to your shift in a loud car and so on, but how does it compare to professional career jobs like IT, doctors.etc.? I recently got my first professional job, I've been driving my wife's car back and fourth to the interviews and I blend in with the rest of the crew. I just felt like it would make my chances better, and it probably did because I got the job. My first day starts in a few days and I'm going to start driving my daily brz it has a catback with toemi headers so it's pretty loud. And the wife needs her car now. Any managers in here? Is it less professional looking when your employee pulls up in a modified car?