Hey the Duratracs are definitely louder than stock, but I switched out stock for Cooper ST's as soon as I bought it, so can't really remember the difference. They aren't loud at all, run smoother than my old Coopers and I love them. My MPG seemed to go down a bit, but then again I threw on the TRD exhaust a few months ago and that with the TRD CAI and I can't stop rippin' around town haha. Sounds friggin cool and it rips vs stock!
