Hey I can flash Phatboxes for people. I have done several now. I flashed the Keg that i sold to Badfish. You can get the phatbox cables from any Mazda Dealership. but you have to have a good parts guy to find them.
Here are the part numbers
Mazda Mazda3 Phatnoise Install Kit
0000-81-L01 this part number is the short cable for the Mazda3 it should be about $35
0000-81-H01 this is the part number for the much longer Mazda 6 cable. both are the same cables just one is much longer as the 6 mounts the PB in the trunk. this cable is about $40-45
The VW/Audio units can be purchased on ebay for about $200-250 with a 20 gig DMS cartridge. these can be hacked to accept up to a 120gig drive. these use a ruggedized laptop drive and there is lots of info on Phathack about it. some guys have actually been able to get a 160 gig drive to work but that requires much more work as you literally have to replace the OS in the phatbox and thats not the easiest thing to do and it has limitations.
There are some older Phatboxes that wont work so stick to the VW/Audio units or the Music kegs.
The Music kegs are actually really cool for Modding. Under the plastic covers is an internal box with a black plastic front lip. this would be an easy mod to put a PB where the ashtray is etc.
The VW/Audi units have this retardedly huge heatsink that performs zero function. its just a big hunk of aluminum for show. But. inside there is just a PCB mounted to a sheet metal base so modding is much harder to make work.
The circuitry is exactly the same for both boxes. The phathack website has many many details about these units.
One thing to be cautious with. is that some people mount these in palces where moisture can get inside. the circuit board will corrode if exposed to moisture so underseat mounting is not a great idea. or trunk mounting where rain could get to it if the trunk was opened etc.
Also, while the harddrives are ruggedized. they are a harddrive and if dropped, can break, etc.
Navigation with the voice prompts takes a little while to get used to. but it sure beats doing 70 and juggling a tiny screen to navigate!
it is stupid that Mazda charges so much for these damn things. Just to fight the man i am willing to help anyone that wants a PB!
Zc