1)Get any free flow exhaust
2)1.75"=2" piping (inner diameter)
3)3-1 headers (get specs from teamswift or suzukiRD)
4)Simota Airintake / or build a custom one
5)Get plugs and wires changed
6)Order a light weight flywheel from SuzukiRD
You should be able to beat the new stock city after these mods