Bilstein B6 for the front axle and B4 for the rear. Lower it on Tanabe springs. Don't forget the sway bars front/rear.
Thanks for these suggestions.
I am looking at the sway bars.
Just to control costs, I was hoping I might avoid having to do struts and springs, though. It looks like some users have added Tanabe springs, without replacing the struts. (Eg iDrive's Mazda 6.)
I can't tell whether I'd need/want to do the struts also.
But if I do need both struts and springs- for similar expense, I could put in coilovers instead. Then I'd be able to fine tune the suspension and the lowering ... and, lower a little further than the Tanabe springs. Finally, I think coilovers would allow me to adjust the camber, if necessary (instead of a separate camber kit). Is all this right?
As you can probably tell from my questions, I'm not very familiar with these components - so please excuse me if my questions are ignorant. (I added some suspension upgrades to an Audi, about 15 years ago - but that was all done by a local shop, and I just followed their advice. I was very happy with the result....)
Shops around the east bay aren't all that familiar with the 2018 Mazda 6, unfortunately, so it's not easy to get upgrade advice from the local Mazda performance experts.