There might be some variation between BOSE and basic headunits. I'm not immediately sure if all 6MPS came with the BOSE unit, however a bit of a search online turned up the following:
You've probably already seen this already. I did a forum search and haven't found a mazda 6 guide or details yet.
I'd take some pictures of the loom connectors and from that you can compare to online info to confirm correct.
Info from lawsjoe:
Pre-Amp out for Bose
Front Left-
+ Solid Black
- Solid Green
Front Right-
+ Solid White
- Solid Red
Rear Left-
+ Red w/silver dash
- White w/ silver dash
Rear Right-
+ Green w/ silver dash
- Black w/ silver dash
# MAZDA'S STANDARD BOSE DESCRIPTION From HU
REFERENCE SYSTEM SYSTEM
here is the order of what you sould read: number, reference form Mazda(letter) Bose system color and description.
1 a RED BLACK LF+
2 b RED BLUE/RED Batterie +
3 c GREEN LF-
4 d RED RF+
5 e LGREEN/RED Data
6 f WHITE RF-
7 g BLACK/YELLOW Data
8 i GREEN/RED Illumination
9 j BLACK Remote
10 n RED/BLACK Steering
11 p GREEN/WHITE Steering
12 r ORANGE Accessory
13 s WHITE LR+
14 u RED LR-
15 v BLACK RR+
16 w BLACK/ORANGE Ground
17 x BLUE GREEN RR-
"Blue Meanie" 2007 Aurora Blue MPS 3 - 18x8.5+44 SSR GTX01 - 235/40R18 Michelin PS5 - 3.5" ETS TMIC - CPE stg 2 mount - HKS/CPE BPV - 2XS inlet - 2XS short shift - Corksport turbo manifold - HT 98 octane tune - Leather/Aluminium handbrake - Momo shifty knob - 7" touchscreen - JDM Mazda Retractable dashtop screen assembly - Bespoke Raspberry Pi Android based GPS/Carplay and instrumentation - 36AH reserve battery and C-TEK isolator - TEIN Street Advanced coilovers 1" drop - Superpro bushings - 220Kw/410Nm.
"Lipstick" 2013 Velocity Red MPS 3 - 18x7.5+48 Enkei RPF1 -225/40R18 Federal RS-RR - CPE TMIC - COBB inlet - CPE stg 2 mount - COBB Stage 1 98 octane tune - COBB shifty knob - 2XS short shift - 2XS turbo manifold.