adjmcloon said:I had it done a while back. They pull the headliner, and basically apply this industrial adhesive to the crossbows and glue the roof to them. Makes a HUGE difference in how quiet the cab is. Mine was night and day.
I didn't really have any trouble with leftover parts or a bad install. I would suggest talking to whoever is going to do the work and make sure they've done a few- I wouldn't want to be the guinea pig. Other than taking the headliner down it doesn't look like that big of a deal.