I have a 2006 Mazda 3 and I'm wanting to put in an AUX port for a mp3 player in any ideas or mods you guys have done?

 

i cant remember if there is a port behind the headunit for it

 

There are a bunch of options for you depending on what you'd like to have. If you just want a simple audio input then you can obtain that with a grom module, or an auxmod basic. The grom plugs into the port on the back of the HU (the same port used by the OEM sirius and ipod adapter) and the auxmod uses the port on the bottom of the HU used for the OEM TAPE/MD modules.

Alternately if you're planning on plugging in an ipod then you could get one of the multitude of ipod integrations modules. The details differ between the different modules, but for the most part they will charge you ipod/iphone and allow you to control the device from the stereo controls.

There are details on a bunch in the audio input thread linked in my signature.