Power
Spark plugs
Restores lost power
Hard$50–$1502–3 hrs
Home › Subaru WRX / STI
Subaru WRX / STI mods
Every US WRX and STI. Pick your year, engine and body below to see only what fits your car.
Your WRX
Pick your year to see what fits.
This page covers the WRX and STI. The non-turbo Impreza has its own page.
Engine 2.0L, 2.4L or 2.5L turbo flat-4
Stock ~224–310 hp
Weight ~3,100–3,500 lb
2002–2026
+20–50whp est. · The biggest bang for your money
Easy$735–$77030 min
Power
Cold air intake
+5–15whp est. · More turbo sound
Medium$235–$5901–2 hrs
Power
Downpipe
+15–40whp est. · Biggest bolt-on gain, needs a tune
Expert$720–$1,4003–6 hrs
Sound
Cat-back exhaust
+3–10whp est. · Better sound, lighter
Medium$835–$1,6201–2 hrs
+0–15whp est. · Keeps power on hot days
Hard$700–$1,1551–2 hrs
Handling
Coilovers
Adjustable height and stiffness
Hard$1,150–$1,9804–6 hrs
Handling
Lowering springs
Lower, with less roll
Hard$315–$3954–6 hrs
Handling
Rear sway bar
Flatter, less understeer
Medium$250–$3201–2 hrs
Handling
Short shifter
Quicker, tighter shifts
Medium$140–$3401–2 hrs
Handling
Pitch stop mount
Crisper shifts and launches
Easy$88–$9930–60 min
Brakes
Brake pads
Stronger stops, less fade
Medium$105–$2101–2 hrs
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HP numbers are wheel-horsepower estimates.