I'm putting in a set of components in a 2002 nissan sentra gxe, and was wondering if it would make any difference, if I installed the speakers into the actual door siding instead of behind it.

 

Yes it will.

 

Take some pictures. I have an 01 GXE, and I put them on the black mirror panel on the door. they Sound good there. I'll get some pics in a bit.

 

ok I'll have to get some pics up in a week or so. Just on business trip lol I have a picture i found on cardomain with something similar to what i was asking.
http://www.cardomain.com/ride/3068042
if you scroll down you can see what the speaker looks like. I was just wondering if I have it like this if it's going to sound bad/good or rattle a crap load.

 

That speaker is mounted to the door and has a grill on the front of the door panel. Cutting open the door to get an unobscured sound pathto your ear is technically good. But for all the ffort kickpanls would be phenominally better. Or doing a proper fiberglass door pod build. Just mount them solidly and sound deadenin your door and don't cut up your door panel Aftermarket grills don't look cool.