Would a 2nd gen nav system work in a 1st gen that had nav?

[treesleavedents]

I've been poking around on here trying to find the answer to this for a few days now. I found the thread where the guy put a nav system into his wifes matrix. But he had to do a ton of work because it wasn't originally equipped with the GPS module, etc.

What I want is to add a small subwoofer hidden under the rear floor, and aux input to the head unit.

Here's where I have to decide which route to take. I like the look and functionality of factory nav systems. Aftermarket ones look tacky and don't look like they should fit since you have to buy the dash kit. Ideally I would love to take an 09-10 nav system and install it into my 03, but I have no idea if it would even fit in the dash bezel... And if it did, would the hardware for the GPS and other stuff work with a newer unit?

If that is impossible, I would like to add an aux input and sub line out on teh existing 03 nav system. Any idea if that's possible?

[gtv237]

Without a lot of reverse engineering your best option is aftermarket. I'm sure you can find one that looks acceptable.

[treesleavedents]

Unfortunately the only ones that look even close to acceptable are the chinese aftermarket ones that are tailored to individual cars... When I was car shopping the Mazda3 forums had a ton of info on one particular brand and model. Very cool stuff, but doesn't seem reliable. I'm not stranger to splicing soldering and dash removal so I figure I'm gonna try to find the wiring diagrams for both and see if it's possible.