I know people that swear by them and others that call them a gimmick. I use one because a fellow car audio enthusiast of mine has been using his for years and he's my go to guy for anything related to the subject.
@floridaplur I just upgraded my setup on my 17' Sport. I did The Big 3, ran new power and ground, and installed KnuKoncepts Ultimate Battery Terminals. I went ahead and just did everything 0/1 AWG wire. I haven't noticed much of a strain yet, I do have a 4 Farad Capacitor on my system already...
https://www.amazon.com/dp/B001715RQS/
Get one of these, as long as its a non-bose model you won't have to cut into any factory wiring. It should be the same as my 2017.
Honestly, just upgrading your license plate lights adds visibility. I replaced mine with Sylvania ZEVO LED bulbs and honestly that's enough for reverse lights.
SYLVANIA 2825 WHITE ZEVO LED Mini
From what I've read and talking to my Mazda Service Tech, you are stuck with the stock alternator, it throws codes and messes with the ECU if you put in a different alternator. If anything run a 2nd battery, that's my plan in the future.
Mazda noticed it was leaking by the seal, they replaced the seal. I went in for another oil change and they noticed it was leaking from the new seal. Then they realized the rear diff was bad, my Service Tech pitched a fit and I went home with a new rear diff free of charge. ** Disclaimer, I...