Car Stereos: 2005 Mits Montero Tweeters/Sub, infinity gold, infinity system

Question
Been looking for a wiring diagram for this vehicle audio system, but difficult to find. Anyways, It has the factory Infinity system with 6 CD Changer. I also have an older (2001) Jeep GC with factory Infinity Gold. The Jeep's system is 10 times better than the Mits system. So, I want to change the speakers/sub on the Mits keeping the factory head unit, and amp. The rear doors are no problem, but the front doors have component speakers with the tweeter mounted in a factory pod in the door. The pod is sort of rectangular in shape, but not sure what type of tweeter resides inside. Also, the sub is mounted in the rear (left side) cargo area, but don't know it's size or mounting depth either. Two questions:

1. What tweeter size/shape will fit the factory location/mount? As I want to use component speakers for the front door.

2. What sub size (diameter and depth) will fit the factory sub mount/panel enclosure? I use the cargo area often. So, until I go ahead and mount new head unit, better wiring, and amps I would like slightly better bass, but at the convenient factory location.

Thanks in advance...

Answer
Hi Juan,

My information shows a 1" tweeter in the front door.  This is a pretty common tweeter size for after-market component speaker systems, but I'm not sure what you'll need to do to mount a new tweeter; sometimes you can modify the factory mount for an after-market tweeter, and sometimes you can't.  Unfortunately, I haven't changed the speakers in one of these vehicles, so I can't tell you what to expect.  

The subwoofer should be an 8" sub with up to 5" mounting depth.  I'm pretty sure this is just mounted straight into a metal wall behind the side interior panel in the cargo area; it doesn't use an airtight enclosure like a typical after-market subwoofer.  This means that you'll need to choose a replacement sub that's designed for free-air use.  Kicker's Comp series subwoofer would be an option; also, most subs made for marine use can be installed in a free-air system.

Personally, I'd consider replacing the factory amplifier with an after-market upgrade, rather than trying to keep the stock amp working with after-market speakers.  The connection between the factory head unit and the amplifier is a type that would be fairly easy to adapt to an after-market amplifier's inputs.  

Hope this helps!

Brian