Must need little item...
2001 Ford Mustang
Crutchfield Customer Review (What's this?)
Perfect part of the install kit for the OEM amp use via the new head unit in a 2001 Mustang GT with the Mach 1 stereo system. It was provided by Crutchfield and later I found out it is a must have to eliminate the "popping" sound through the system speakers when the head unit is first powered up.
Pros: Easy install and was free as part of installation gear package deal.