Do strut bars make a difference?
i don't know
>>16440991
How Front Suspension Works - /ENGINEERED
https://www.youtube.com/watch?v=x0oi9SHJPvg&t=505s
yes, a bit
Varies car to car
if your car needs them so it doesn't split in half, then yes
I think only convertibles really benifit from the extra bracing.
On a hardtop the advantage would be negligible, otherwise they would fit them from the factory.
They add 10-20lbs to the car.
That being said, one of my cars still has the strut bar that it came with in the back. I haven't bothered to remove it.