What is you car?Type UK or JDM?
Spend some money on the chassis fisrt then look for more power..
What turbo are you running with your fmic?
I only know a few people running GEMS in this neck of woods so where did you get the ECU from and who maps it?
This will be critical as i you will need to remap it again when you going to put new mods on.
What colour is your car and can you show us a pic of it?
Could meet up with you if you want to find out more.