I have KYB AGX with ground control lowering springs in the back, stock struts with soon to be the same type of ground control springs in the front.

I have a Godspeed front sway bar coming in the mail, should be here by Tuesday, and over the next month or two, will be getting the rear sway bar, as well as front and rear strut bars.

Now, these are my 'going to get' parts, I am kind of questioning the Tanabe Underbrace, increases stiffness, but how much does it really help handling?

Input?

 

the front frame of the FC is pretty stout. especially if you already have a front strut bar installed.
but if you are going to get a front lower arm bar, I would suggest getting Himni racing underbar, atleast that is adjustable unlike the tanabe, and its cheaper
http://www.himni-racing.com/index.ph...products_id=70

Lower arm bars doesnt help much unless you are subjecting the car to increase lateral Gs loads on turns.
I dont have a front strut bar, only the lower arm bar, and comparing before and after I can feel the difference in flex, but only when you are pushing it hard. Stability in cornering.

if I remember black91 did a write up on it.

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/how-build-lower-arm-bar-under-%2415-448638/

Black91 write up
I remember reading this and then buying the Himni bar instead of making my own lol
this is the himni installed on mines
http://imgur.com/FOYbo