Where is the port for a remote wire on a stock '96 dodge intrepid stereo?

Stock head units do not have a blue remote wire. You need an aftermarket deck, or you will need to provide power on your own, but should switch it as the amp will be on all the time if you don't and it will drain your battery.

Here's the stock stereo wiring info but I'am sorry to say that you'll need to install an aftermarket system if you want to use the amp remote feature. 1996 Dodge Intrepid Car Radio Stereo Audio Wiring Diagram Car Radio Battery Constant 12v+ Wire: Black/Yellow Car Radio Accessory Switched 12v+ Wire: Red/White Car Radio Ground Wire: Chassis Car Radio Illumination Wire: Orange Car Stereo Dimmer Wire: Pink Car Stereo Antenna Trigger: Orange/Red Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Dark Green Left Front Speaker Negative Wire (-): Brown/Red Right Front Speaker Positive Wire (+): Violet Right Front Speaker Negative Wire (-): Dark Blue/Red Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Brown/Yellow Left Rear Speaker Negative Wire (-): Brown/Light Blue Right Rear Speaker Positive Wire (+): Dark Blue/White Right Rear Speaker Negative Wire (-): Dark Blue/Orange Hope that helps and best of luck.