The FA20 in the 2015+ WRX is simultaneously the best and worst thing Subaru ever did. Unlike the bulletproof EJ257, the FA20 responds incredibly well to bolt-ons but punishes owners who don't understand its limits. One poorly tuned accessport flash and you're looking at a $8k motor rebuild. → Responds great to proper tuning → Intake/exhaust combos that destroy ringlands → Red flags that scream "walk away" → Smart mod path for longevity → Pre-purchase inspection checklist Save this before you shop - the difference between a solid FA20 and a ticking time bomb often comes down to how the previous owner modded it. #ThreePieceUS #SubaruWRX #FA20 #WRXBuying #SubaruLife #BoxerEngine #CarBuyingGuide #JDM #WRXNation #SubaruMods