Have a look at the blog on suspension & handling by Corksport. If you are not into adding HP then this how you can also make your car faster.
In my opinion , you should be doing this first before adding more HP. Everybody loves the pull of accelerating on the the highway from extra HP.
TBH, straight line speed is ok. My thrill is on that hairpin on ramp at double the suggested 40-50KMH speed until the rear end starts to slide out
and then starting to accelerate just before hitting the apex. How about also being able to go 120KMH - 0 in less than 100 feet. So.... its all about
suspension and brakes. Oh ya ... The tires is a huge component if not the most important 1st step towards better braking
and handling without even doing any of the suspension modifications in the blog below.....
Follow the link below & read how Corksport do it with their track car.
Applicable to all generations of Mazda 3's ...
https://corksport.com/blog/mazda-3-suspension-handling/