Ive searched and read many threads and posts about kartboy ss + bushings. I have a 13 wrx that came with the sti ss (spt ss???) I know that i need to purchase new bushings with the kartboy ss. I thought all 13 wrx models came standard with the sti ss? At least every car that ive looked at online and inventory at local dealerships come equipped with it already.
My question is how much improvement am i expecting to see if i upgrade to the kartboy ss + bushings? Ive read around that it can be up to 40% throw reduction but not sure if thats coming from a stock shifter or sti ss? Thanks for reading!