performance mods

I have Ktuner, Bolt on aFe CAI, aFe SS Catted DP, aFe SS Front/midpipe, Full aFe SS Cat-back dual exhuast, Im still debating Misimoto vs PRL for intercooler, I need tires, Ive been staring at the 27won RMM for a quick minute, after that besides a drop in turbo, what else can I do?

Just bought this baby and am already curious on the next step in performance :) Is there anything available for the 2018 Si's yet? Do mods for the 2017 work on the 2018? Thanks in advanced!