Lightened Yaris

[HTM Yaris]

I say the roof weighs close to 300 lbs ( actual roof , glass, hatch, and panels etc) , but I doubt anyone will cut off their roof so we could find the exact weight

Also by definition any time you remove weight from the center of any object it makes it top heavy . You are correct in thinking the Yaris won't tip over at every turn by losing 111 lbs , but I am correct in saying it won't be a fun drive in a lightened Yaris on a 12 % grade in icy/windy conditions . Not to mention big rigs blowing past you and pushing you around .

To answer the ride quality question , the heavier Yaris will give the better ride quality . Go try it out for yourself . Just ride in you Yaris by yourself . Then ride with 1 or 2 adult passengers in the back seat . You will feel the difference fo sho .

Here in South Carolina , we don't have car inspections . But if we did and I wanted to remove the pass. airbag , I would be smart enough to remove the indicator bulb as well

Oh about the flywheel , true you can lose a lot of rotating mass , but the trade off is drivability . IMO the stock Yaris flywheel is perfect . With a light weight flywheel you will have to "blip" the throttle to match revs to make gear transitions smooth . With the stock flywheel the weight of it keeps the momentum up making gear changes much smoother .