The Spal power window system was a breeze to mount to the OEM window regulators, and works quietly and smoothly. While you're working with the doors, don't forget the Dynamat or other insulation--it'll help the doors close with a solid thunk instead of sounding like a tin can. Now you can start to understand why a top-notch interior is so costly--this work is time consuming. It's a perfect place to save money by doing it yourself, even if you send the finish work out to a pro.