Found this website, thought it might be useful for some people who wanted to know more about their MPS
How to use the ON-BOARD DIAGNOSTIC TEST MODE for The Audio unit
Mazda 3 MPS Sports Car
http://www.msprotege.com/forum/showt...hp?t=123719103 - This is probably the most useful, it is a DIY guide to tapping into the facotry BOSE amp
http://www.diymobileaudio.com/forum/...h-install.html - fiber glass DIY sub install