My 2010 ES350 could use a larger diameter front & rear stabilizer bars to reduce body roll. I replaced all the struts with KYB gas, keeping OEM springs. I know this model was not intended to be a high performance car and a soft ride and rider comfort were priorities. Reducing body roll by increasing the diameter of the sway-bars should achieve that goal without making the ride harsh. Has anyone addressed this issue?

 

this might be what you’re looking for:
https://www.clublexus.com/forums/es-...body-roll.html

 

There are many older threads where folks discuss using Camry suspension upgrade parts:

​​​​​​https://www.clublexus.com/forums/es-...-sway-bar.html
​​​​​​https://www.clublexus.com/forums/es-...red-07-es.html
​​​​​​https://www.clublexus.com/forums/es-...for-es350.html
​​​​​​https://www.clublexus.com/forums/es-...k-warning.html
​​​​​​https://www.clublexus.com/forums/es-...pressions.html

Always make sure all of your other aging suspension components are in excellent condition before upgrading. Strut mounts, strut mount bearings, (I know you have new struts - did you replace these related parts?) Control arm bushings, rear trailing arm bushings, ball joints, old sway bar links, wheel bearings, tie rod ends etc have a habit of wearing out on 10+ year old vehicles.

You almost always need to cut off the old sway bar links when replacing sway bars as the bolts have rusted in place and those Allen/Hex screws from Toyota strip out when you try to turn them.