I run flowmaster 10's on my car. At idle, they seem somewhat tame but when you give it the gas, they get LOUD. These are 2 1/2 but I'm probably going to change to a 3" system eventually. These are dumped at the axle so I don't think it's going to matter what I run. There is going to be drone at certain speeds. Putting some fat mat in soon so we'll see what that does for drone.
