Anyone have specs on differences btw 2014 and 2015 FR-S
 

Not sure if the BRZ changed also, so can't comment. However, I do see there are some minor changes to the rear suspension and some steering bolts have been upgraded. I've been searching and lurking, but I'm only finding subjective claims.

Anyone got numbers? Which dampers are the new ones, different rear springs? And I read somewhere here, and can't find now, that the front steering added some beefier bolts, longer and stouter bolt heads, which stiffened up the steering feel a bit.

Any links or guidance appreciated. I'm only interested in chassis changes, any lights, leds, hids or what have I don't care about, I'm specifically interested in the handling changes and if the parts are compatible. Or, rather, what out there in the aftermarket achieves the same effect.

This is my DD fwiw.