Celica Forums News Portal r/Celica Which improvement did you make on your celica and make it special? [r/Celica]

So I'm planning to improve my at200, currently I already did some cool things for grip and i'm curious to see what you changed on your celica that made it better, by improvement I mean all type, mechanical, road grip, sound system, reliability, I'm very curious of all posibilities.
If you have any advice I will be happy to hear them, Currently I already changed this:

- suspensions : H&R short springs
- cooling : green air filter ( maybe a direct intake would be a good idea with all the space in the front )
- brakes : Bigger disk, improved brake hose and Bosh caliper
- rims : lightened aluminium 15'' rims
- exhaust : Aluminium exhaust and silencer ( planning to take off the catalyser )

Currently Im thinking on how to improve engine performance even if i know 7aFe is not a good basis for performance but maybe just making it more reliable and responsive is achievable. If you have any advice or experience I will be happy to hear them!