I just bought a infinity 12" sub and alpine 500watt amp. I just want to ADD the sub to the existing setup. I read some threads on how to do this but was wondering if any of you guys had a good link that had pics with it. I've never done an audio installationg but they dont seem to hard. The only issue I think I'll have is removing the back seat to get to the stock amp.

 

Check the A/V section. They prolly have a DIY or something for that.

 

Search google and go on crutchfield.com. Thats what I did when I did my first installation and now I'm doing them for all my friends

It's easy once you get the hang of everything. Check the DIY section for removing the back seat. When running the wires from the front of the car to the back, I always run them under the door sills. Hide every wire, gives it a very clean and professional look.

Good luck!