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Pistons
- 79mm Stroke, 99.75mm Bore, -22cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 99.75mm Bore, -17cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 99.75mm Bore, -10cc Dome Volume, 9.8:1 CR
- 79mm Stroke, 99.5mm Bore, -22cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 99.5mm Bore, -17cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 99.5mm Bore, -10cc Dome Volume, 9.8:1 CR
- 79mm Stroke, 99.55mm Bore, -22cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 99.55mm Bore, -17cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 100mm Bore, -22cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 100mm Bore, -17cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 100mm Bore, -10cc Dome Volume, 9.8:1 CR
- 79mm Stroke, 100.25mm Bore, -22cc Dome Volume, 8.5:1 CR
- 79mm Stroke, 100.25mm Bore, -17cc Dome Volume, 8.5:1 CR
- 75mm Stroke, 93.0mm Bore, -12cc Dome Volume, 8.5:1 CR
- 75mm Stroke, 92.5mm Bore, -12cc Dome Volume, 8.5:1 CR
- 75mm Stroke, 92.0mm Bore, -12cc Dome Volume, 8.5:1 CR
Subaru WRX/STi Pistons for Ultimate Performance
Your pistons play an important part in your engine’s heat engine and internal combustion system, converting fuel into energy to keep you moving forward. Located in your vehicle’s cylinders, this moving disc works to transfer the force generated by the fuel into your crankshaft, which in turn powers your wheels.
It’s natural for pistons to wear down over time and need replacement. It’s important to keep them functioning effectively to avoid engine failure, as this can also lead to gas leaks from your combustion system, a loss of compression and lubrication, and an increase in fuel emissions. This, in turn, will affect your car’s overall performance.
Here at ProSpeed Racing, we have everything you need to replace your worn-out parts, with a range designed to suit your Subaru WRX/STi. Look no further – we’ve got your performance needs covered.
How do WRX/STi Pistons Work?
Subaru WRX/STi is a revered performance vehicle and workhorse that’s designed to go the distance. Built with quality parts, your pistons contribute to your car’s overall performance – ensuring you can travel further and faster than ever before.
They do this by converting linear motion in your cylinders into a circular motion. The moving discs transfer the heat energy of expanding gases in the cylinder into the crankshaft, which then provides momentum to your flywheel. By removing heat from the cylinder, this will reduce gas pressure and allows it to be compressed a lot more easily, thus continuing the cycle. This then helps to power your wheels and keep your mechanical system running.
We carry a range designed specifically to suit your Subaru WRX/STi. Check out our range below – and if you’re not quite sure which system will best suit your vehicle, get in touch with our team. We’re happy to talk you through our range of options.
EJ20 and EJ25 Forged Pistons
Subaru’s EJ series of engines has been a mainstay in the industry, and with good reason. The EJ series has powered Subaru’s flagship WRX/STi models for years. If you’re really looking to give your performance a boost, it’s worth upgrading your system with EJ20 and EJ25 forged pistons. These are designed to increase torque and horsepower by providing a higher compression ratio than standard stock models.
Our range includes options for EJ20, EJ25, EJ255 and EJ257. These are all ideal for modified turbocharged motors. Not sure what to choose? Talk to our expert specialists today.
Boost Your Performance
Upgrading your system? Check out our huge range here at ProSpeed Racing – we have everything you need to get your motor running, complete with Australia-wide shipping. For further information, give us a call on (02) 4340 4463 today.


CP Carrillo Forged Pistons Set - Subaru WRX VA 15-21/BRZ/Toyota 86 (FA20)


CP Carrillo Forged Pistons Set - Subaru WRX/STI/FXT/LGT (EJ20)


CP Carrillo Forged Pistons Set - Subaru WRX/STI/FXT/LGT (EJ257)


CP Carrillo Forged Pistons Set 100.00mm 8.5:1 - Subaru WRX/STI/FXT/LGT (EJ255)


CP Piston 9310 Steel Non-Chamfered Wrist Pin - .260 Wall Thickness


CP Piston Ring Set 99.75mm Bore - Subaru EJ25 WRX/STI (Single Piston)


CP Piston Ring Set suit SC7421 Piston - Subaru EJ257 100mm Bore (Single Piston Only)


CP Pistons Forged Piston Set 82.5mm Bore 9.5:1 CR - Audi/VW (2.0 TFSI/TSI EA888)


CP-Carrillo High Performance Piston Pin suit EJ20/25 pistons (Set of 4)


CP-Carrillo Pistons Ring Set RS1658-3917-0 suit CP7420 WRX/STI 2.5


Integrated Engineering Spec Mahle Forged Pistons - Audi/VW (2.0 TSI/TFSI)

JE Forged Racing Pistons Set of 4 99.75mm - Subaru WRX/STI/FXT/LGT (EJ257)

JE Forged Racing Pistons w/22mm Pin Set of 4 - Audi A3, S3 8V/TT 8S/VW Golf GTI, R Mk7 Mk7.5 (EA888)

JE Pistons Forged Piston Set 82.5mm Bore 9.6:1 CR - Audi/VW (2.0 TFSI/TSI EA888)

JE Pistons Forged Piston Set 83.0mm Bore 9.6:1 CR - Audi/VW (2.0 TFSI/TSI EA888)


Mahle PowerPak Piston Set 83mm - Audi S3 8P/VW Golf R Mk6/Scirocco Mk3 (2.0T FSI)


Manley Forged Pistons and Rods suit Ford Focus RS 2016+


Manley Piston Rings Suit Manley Platium Pistons Set of 4 - Mazda 3 MPS/Ford Forcus RS/Mustang (2.3L Ecoboost)


Manley Platinum Extreme Duty Lightweight Pistons Set of 4 - Mazda 3 MPS BK/BL


Manley Platinum Lightweight Pistons 87mm - Honda K24A w/K20A Head


Manley Platinum Lightweight Pistons 87mm - Mitsubishi 4G64 w/4G63 Head


Manley Platinum Lightweight Pistons Set 75mm Stroke - Subaru WRX/STI/FXT/LGT (EJ20)
Universal items are not application specific and may or may not suit your vehicle. Some items may be suitable but are listed as universal (ie wheel nuts, oil filters) and In some circumstances a product may not fit automatically but can still be used with some modification (ie. catch can/gauge pod etc.). Be sure to check if the product is right for you or ask us for assistance before purchasing. Filter universal products by selecting “Show Universal Products” from the filter products menu.