I'm about to dive into the handling of the car and would like advice on if I should be adding anything else. So far I have

Koni red shocks
NM Lowering springs
NM lowering springs
NM rear sway
Hotchkis rear camber links
Ireland Engineering fixed camber plates
NM engine torque mount

Thinking about powerflexing everything but am unsure. Is there anything else that I should be upgrading while I'm at it?

 

Switch out the Koni Red's for Bilstein B8s. Koni Reds are not designed for lowering springs, and the Bilsteins are a better damper.

Add front PowerFlex control arm bushings. Get these in the pre-pressed option:
https://www.waymotorworks.com/powerf...7-r58-r59.html

 

Like njaremka said the Koni FSDs don't work with lowering springs.
I would go with the Koni Yellows as they will work with lowering springs and are adjustable.
https://www.waymotorworks.com/koni-y...5-r56-r57.html

Or just do a full upgrade with a set of coilovers with our matched springs that will ride well and get the camber dialed in.
https://www.waymotorworks.com/megan-...5-r56-r57.html

Then for bushings, grab the R56 Powerflex set and you can replace them all and never need to replace them again, and it will fell like new again.
https://www.waymotorworks.com/powerf...7-r58-r59.html