Here's my suggestion.
You've got a turbo back exhaust system and a nice set of wheels already. Install the FMIC and that's it !!
Almost every other significant mod you do will lead to MORE work needing to be done.
THEN...... Take $50 per week out off your pay and put it in a seperate bank account and don't touch it for at least 1 year ( but keep putting the $50 in per week ).
Now, go and enjoy your car, and know that when the time comes that you have to pay for tyres, rego, insurance, maintenance etc, etc, you will have the money there to do it.
OR
Completely ignor the above and do what I ( and most other's do/did ) and go spend every cent you have on mods and only stop when you sell the car ( for less than you paid for it a couple of years before )