Getting good quality tyres and adding rear door speakers should be the foremost priority. Rest just follow KISS (Keep it Simple) principle.
Personally, I dont like air suppressors and tints. Police will stop you at every check post and would search your car thoroughly and most likely tear it off or fine you for having tinted glasses without permit.
In Lahore you cant go to Mall Road with tintd glasses, if you don't have permit or a strong PAWA.