Quick question, was taking a buddy for a ride who works at a dealership. He made the comment "The last one I drove was quieter." It's been a while since he test drove one, but got me thinking, I bought my NSX used so maybe the PO installed downpipes? (Note: non-Acura dealer I purchased from said it was all stock). I don't know much about downpipes, but is there a quick way I can confirm mine are stock?