I bought my 2006 earlier this year with Sportlines already installed. I haven’t had a Mustang since my 1998, so I’ve been out of the game for a little bit. I recently test drove a 2011 that had stock suspension, and I was amazed at how much quieter it was. I know Mustangs aren’t the quietest cars, but now I’m wondering if maybe the springs in my car are contributing to a large increase in road noise? I’m in AZ, and one of our freeways is a little loud in my SUV, but I’m my Mustang it is down right annoying. Surface streets don’t seem to be as much of an issue, as my exhaust covers up enough noise at those speeds. Just curious to those who have them, did you notice a jump in noise after install? Oh, and if it matters the car only has 47k miles on it and the tires are new Nittos.