Anyone install only trd springs and rear sway?

[AdeJong 03]

Hey guys i just picked up a yaris sedan last week and i just wanna do a couple things to the suspension for now just to get rid of the nasty wheel gap and improve the handling a tiny bit.

I was thinking about just getting the TRD sport springs and rear sway bar so that i can improve my suspension and make sure i dont void the warranty on the car.

I know that when i had my old integra, upgrading the rear sway bar made all the difference in the world when it came to handling improvements. Also, it complemented springs or coilovers in a way that drastically improved performance.

Is this the case with the yaris as well?

On top of these mods I am going to eventually throw on some 16x7s in order to run some wider tires and fill out the wheel wells a bit. I am hoping it comes together nicely.
Is there anyone on here who has installed only those 2 things or maybe a comparable set up? How did the handling improve? Was is worth the money?

Thanks in advance and please feel free to post pics of your car with the set up (especially if its a sedan!)