have a 2007 civic si coupe and would like to change factory speakers in doors has foctory stereo and nav is there any air back sensors in the doors and is there any information or diagrams on the internet ?

I wouldn't worry unless you have side impact air bags.

Go the the forum www.8thcivic.com, there's an entire Do-It-Yourself on how to replace the stock speakers. If all your doing is replacing the speakers you shouldn't have to mess with anything other than taking off the door. You can even keep the stock crossovers if you want.

you dont need to worr about the sensors they are not in the door its self.