I got most of the basics and at near 185whp now.
rear motor mount
Air intake system, aftermarket like steeda or Focus RS airbox w/ highflow filter
Header (obx racing, speed daddy/DNA, etc)
2.5" Exhaust system (fs werks, or an ST system like CNT racing center exit with muffler added in the rear
Custom tuning from Tom/SCT4
2.3L ecoboost throttle body (63mm vrs 57mm oem)
Thats the basics, there is cams but they are $$$$$$$ to buy and install.
175whp/167trq (3rd gear) Steeda intake - MST Hose - CFM RMM - JBR PSM - TTR UMM - CNT 2.5" Exhaust - FS Werks MK2 header - SCT tuning by Tom - 63mm TB, TTR Intake manifold paperweight - 180deg tstat - Steeda RSB -