I currently running Koni's with 450F/375R lb coilovers. Front sway bar is the Tripoint .188 wall and the rear is stock 93FD 17.3mm. My desire is to soften the rear. I would like to try 350 lb springs and the 95 FD rear bar 15.9mm. My question is, how much % of reduction would have taken place. Thanx much...

 

Heck I run 550 F, 450 R..

I'd start by just reducing the tire pressure.

 

Suspension equations