id like to put a single 10" sub in but not replace the head unit. how much well it distort the sound if at all?

 

Just do it right. Install a line-out convertor and add a small amplifer. With everything tuned correctly--it'll add a nice even tone to your stereo without drowning out your highs.

 

Just make sure you also get good stuff go to a local stereo shoop and get everything you need their,don't buy cheap or it will sound cheap just stick with name brand stuff like JL Audio, Memphis , Kicker, Rockford, Alpine ect.. and you will be happy.I also happen to own a stereo shop and have been installed for about 9 year now so if you have any questions just let me know.

 

It'll sound fine if you use the right parts. Here is the link to my install on routing the wires, etc.

https://mustangforums.com/fb.asp?m=3333162