I am running a stage two tune with borral exhaust. Have ecm tuned by Detroit tuning and running stock turbo. Looking to see what i can do with the N18 when it come to building it to gain more HP or what others recommend. Trying to hit the 300 plus range but not sure everything i would need. Thought about forged head and pistons and a bigger turbo but not sure what else to get.

 

Bigger turbo and meth injection manifold should get you to ~300hp. You will need a retune. If you will have Detroit Tuning perform the retune, you should pick up the phone and talk to them to see what they would recommend.