Doesn’t the fiberglass eventually burn out of glass packs? I can’t remember where I heard that from but it’s the reason why glasspack mufflers sound...
Life long fuel sipper for daily drivers (make up for it in the old muscle cars on the weekends) Lover of all things Petrol. I am a tire engineer who will try to answer any question you may have about tires. Divorcee with two amazing kids.