Stiffer suspension
 

I am thinking on getting better springs and stuts to get a better suspension because my rear is bottoming out to much often when I am driving on the road on bumps and other crap oin the road .... what do you think I should get ... I dont want lower the car I want to bring them stock height I just want to make my suspension better

https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/spring-rates-other-basic-suspension-info-79096/

Advertised lowering of spring per brand is listed there.
MS, Racing Beat and Tein H-Tech offer the least drop.
Pair the springs with Koni SA or Tokico D-Spec dampers and you're set.