So after making the video on how to make "X" Horsepower in a Subaru WRX STI, you guys wanted on one the FA20DIT WRX. So here ya go! Remember there are multiple ways to make power, there are multiple parts you can use.
This is my list of what parts I suggest and the modification path I would follow.

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Cobb Tuning E30: https://bit.ly/3ErEBaQ
Socal Porting: https://socalporting.com/v3-fa-wrx/
Phatbotti tunning: https://phatbottituning.com/faq-u

300 WHP
Cobb Accessport
Grimmspeed / Cobb Big SF Intake
Catted J Pipe (Cobb, Grimmspeed, Invidia, MA Performance)
Catback Exhaust (Get whatever you want)
3 Port Boost Controller (Whatever brand you want, Cobb Grimmspeed etc)
Top Mount Intercooler ( Process west, grimmspeed, cobb etc)
Bonus: Radium Dual Catch Can

350 WHP
*FA20DIT Safe Spot for short block)
Cobb Accessport
Grimmspeed / Cobb Big SF Intake
Catted J Pipe (Cobb, Grimmspeed, Invidia, MA Performance)
Catback Exhaust (Get whatever you want)
3 Port Boost Controller
Top Mount Intercooler Charge piping
NGK2309 Spark Plugs
AEM 340LPH/DW300C Low-pressure Fuel Pump
ACT HDSS With Stock Flywheel (Make sure to resurface it and replace your TOB)
Grimmspeed/PLM/Killer B Exhaust Manifold
E30 Tune

Bonus: Radium Dual Catch Can *TGV Delete*, *EGR Delete*, Perrin Turbo Sump restrictor pill

400WHP
*For Reliable power I would build the engine at this point
Cobb Accessport
Grimmspeed / Cobb Big SF Intake
Catted J Pipe
Catback Exhaust
3 Port Boost Controller
AEM 340LPH Low-pressure Fuel Pump
ACT HDSS With Stock Flywheel (Make sure to resurface it and replace your TOB)
Cobb/Delicious Tuning Flex Fuel Sensor or Snow Performance Methanol; Kit
Exhaust Manifold (Killer B/Grimmspeed etc)
NGK2309 Spark Plugs
Turbo Inlet (Perrin/PLM/Whatever you want)
ETS/PLM/Grimmspeed FMIC (Ideally 3-3.5” Core)
Cobb LF Bypass Valve
*SoCal Upgraded Stock Turbo With Turbosmart IWG ($875)
Port and polish to the stock turbo
*FP Blue Turbo (Rated Between 400-475WHP) ($1800)
Bonus: Radium Dual Catch Can, *TGV Delete*,*EGR Delete*, Perrin Turbo Sump restrictor pill

450 WHP
Cobb Accessport
Grimmspeed / Cobb Big SF Intake
Catted J Pipe
Catback Exhaust
3 Port Boost Controller )
AEM 340LPH Low-pressure Fuel Pump
NGK2309 Spark Plugs
ACT HDSS With Stock Flywheel (Make sure to resurface it and replace your TOB)
Cobb/Delicious Tuning Flex Fuel Sensor or Snow Performance Methanol; Kit
Turbo Inlet
ETS/PLM/Grimmspeed FMIC
Cobb LF Bypass Valve
PLM EWG Exhaust Manifold
X2 Tial 38mm EWGs
Nostrum High-Pressure Fuel Pump (This will allow you to run straight E85 and will be needed at this point)
*SoCal Upgraded Stock Turbo With Turbosmart IWG ($875)
Port and polish to the stock turbo
*FP Blue Turbo (Rated Between 400-475WHP) ($1800)
Bonus: Radium Dual Catch Can, *TGV Delete*,*EGR Delete*, Perrin Turbo Sump restrictor pill

500+ WHP
Cobb Accessport
Grimmspeed / Cobb Big SF Intake
Catted J Pipe (Cobb, Grimmspeed, Invidia, MA Performance)
Catback Exhaust (Get whatever you want)
3 Port Boost Controller (Whatever brand you want, Cobb Grimmspeed etc)
AEM 340LPH Low-pressure Fuel Pump
NGK2309 Spark Plugs
Cobb/Delicious Tuning Flex Fuel Sensor or Snow Performance Methanol; Kit
Turbo Inlet (Perrin/PLM/Whatever you want)
ETS/PLM/Grimmspeed FMIC (Ideally 3-3.5” Core)
Cobb LF Bypass Valve
PLM EWG Exhaust Manifold
X2 Tial 38mm EWGs
Nostrum High-Pressure Fuel Pump (This will allow you to run straight E85 and will be needed at this point)
Twin Disk Clutch (XClutch/Exedy etc)
IBR Port Injection Intake Manifold / BRZ Intake Manifold
IBR SIC01 Secondary Injection Controller
Fuel Pressure Sensor
ID Injectors (Sizing will be based on tuner recommendations)
IBR Fuel Rails
Aeromotive A1000
-6 AN Fuel Line
*FP Blue Turbo (Rated Between 400-475WHP) ($1800)
Bonus: Radium Dual Catch Can, *TGV Delete*,*EGR Delete*, Perrin Turbo Sump restrictor pill

Tools For The Garage:
Special Oil Funnel: https://amzn.to/3oeyiCq
Coolant Burping Tank: https://amzn.to/3iesMfn
3/8" Socket Seet: https://amzn.to/3uf2dLT
1/4" Socket Set: https://amzn.to/2XPEd5K
3/8" Impact Gun: https://amzn.to/3lYfO6q
3/8" Ratcheting Wrench: https://amzn.to/3ueQNYu
Batteries for those electric tools: https://amzn.to/3zQE5A5
Floor Jack: https://amzn.to/39KdE4y
Jack Stands: https://amzn.to/2WfVWCT
Gucci Screw Driver Set: https://amzn.to/3EXGTPN
Hook and Pick Set: https://amzn.to/3kJdeBJ


Audio:
Chill - Sakura
Nouvelle Lune - AWN
Underground Star - LoxBeats