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Wiseco Pistons - Subaru
Piston Sets Include: moly coated skirts, rings, wrist pins & circlips.
(* = Custom Set, non-coated, not supplied with rings. Order RINGS separately here)

Wiseco Sport Compact Pistons
are made from dedicated forgings produced in-house to give you a light weight piston with superior strength and optimal design. As the multivalve piston technology leader, the line features specially designed valve pockets, complex dome and crown shapes, the steel nitride/napier xx rings and optimized skirt profiles.
 
Stocking Shelf Pistons Come Complete With:
  • Aerospace grade materials, forged for maximum strength.
  • Precision tolerance CNC machining for quality, repeatability and performance.
  • Crown thickness and ring lands designed for power adders such as forced induction (turbos & blowers) and nitrous oxide. (Note: High comp. pistons are generally designed for nat. aspirated engines)
  • High Quality Piston Rings featuring positive twist nitride steel top ring, Napier 2nd ring, and nitrided rails on a specially designed expander for the best oil control.
  • Wrist Pins constructed of chrome moly steel material for the ultimate in strength.
  • Honed/Reamed pin bore holes for a precise tolerance fi t between wrist pin and piston.
  • Wire Retainer Clip Lock, featuring chrome silicon material for the ultimate yield strength.
  • Piston deburred for performance and reliability.
  • Pistons come standard with our ArmorGlide® coating material for reduced friction and noise, freeing up horsepower

ArmorPlating ("AP")
ArmorPlating increases durability of the ring grooves and helps prevent micro welding. This tough coating combats the erosion on the crown of the piston caused by detonation. [Complete "AP" Info Here]
"AP" for Stocking Pistons - Any pistons ending in “AP” have ArmorPlating INCLUDED
"AP" for Custom Pistons* - Add the ArmorPlating to any CUSTOM Piston set marked with an * below for only $25 per piston. Call to order at (603) 378-0090, or CLICK HERE to add it to your ONLINE order.

K1 Rods Available = Matching K1 Rods and/or cranks available

Custom Built Pistons
In addition to the pistons below, IPP in conjunction with Wiseco is also able to build you custom pistons for just about any sport compact or import engine.

MAP Pricing Policy

MAP (Minimum Advertised Pricing) is what we are allowed to show for all our Wiseco Pistons.
However, if you take a quick second to call or email us, we can give you our best lowest pricing on your Wiseco Piston set, which beats the Wiseco MAP price. Never pay MAP, call IPP!

Subaru EJ20 2.0L 16V DOHC Impreza WRX (Oct. 1998 & older)
pistons are .012 above deck: use stock head gasket or W6174 Cometic Gasket
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K576M925 $537 92.5/3.641 0 2.952 5.137 1.312 - -17.8 7.8 .9055 1
Metric K576M93 $537 93.0/3.661 0 75 131 33.3 - -17.8 7.8 23mm 1
K1 Rods Available   Optional K1 Rod for EJ18/20/22/25/257 Series: Part # 039DD21131 (5.167” / 131.25mm)
 
Subaru EJ20 2.0L 16V Impreza WRX (Oct. 1998 & newer)
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K588M92AP $545 92.00/3.622 Std. 2.952 5.137 1.29 48 -9 8.35 .9055 1

Metric K588M925AP $545 92.50/3.642 .020 75 131 32.7 48 -9 8.35 23mm -
K588M93AP $545 93.00/3.61 .040 same as above -
K1 Rods Available   Optional K1 Rod for EJ18/20/22/25/257 Series: Part # 039DD21131 (5.167” / 131.25mm)
K1 Rods Available   Optional K1 Cranks Available! (EJ20/25 Dual Thrust Series)
 
Subaru WRX EJ20 79mm Stroker - Pre October 1998
(
Rear Thrust - DOHC Crank, Sleeved Blocks w/o access holes)
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K579M925 $537 92.5/3.641 0.020 3.110 5.137 1.181 - -17.8 8.5 .9055 1
Metric K579M93 $537 93.0/3.661 0.040 79 131.5 30 - -17.8 8.5 23mm 1
K1 Rods Available   Optional K1 Rod for EJ18/20/22/25/257 Series: Part # 039DD21131 (5.167” / 131.25mm)
 
Subaru WRX EJ20 Stroker - After October 1998
Rear Thrust - DOHC Crank
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K579M92B $519* 92.0 std 3.110 5.137 1.181 - 11.5 8.5 .9055 1,3
Metric K579M925B $519* 92.5/3.641 0.020 79 131.5 30 - 11.5 8.5 .9055 1,3
  K579M93B $519* 93.0/3.661 0.040 same as above 1,3
K1 Rods Available   Optional K1 Rod for EJ18/20/22/25/257 Series: Part # 039DD21131 (5.167” / 131.25mm)
* Non-coated, not supplied with rings.
Subaru EJ25 2.5L 16V SOHC Imprezza RS, Forrester & Legacy
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K600M995 $545 99.5/3.917 std 3.110 5.181 1.181 50 -18 8.5 .9055 1,3
Metric K600M9975 $545 99.75/3.927 .010 79 131.6 30 50 -18 8.5 23mm 1,3
  K600M100 $545 100/3.937 .020 79 131.6 30 50 -18 8.5 23mm 1,3

Inches K600M995B $519* 99.5/3.917 std 3.110 5.181 1.181 50 -4.4 9-1 .9055 1,3
Metric K600M100B $519* 100/3.937 .020 79 131.6 30 50 -4.4 9-1 23mm 1,3

Inches K600M995C $519* 99.5/3.917 std 3.110 5.181 1.181 50 -1 10.5-1 .9055 1,3
Metric K600M100C $519* 100/3.937 .020 79 131.6 30 50 -1 10.5-1 23mm 1,3

Inches K600M995D $519* 99.5/3.917 std 3.110 5.181 1.181 50 5.4 11.5-1 .9055 1,3
Metric K600M100D $519* 100/3.937 .020 79 131.6 30 50 5.4 11.5-1 23mm 1,3
K1 Rods Available    Optional K1 Rods Available
Optional K1 Rod for EJ25 Non Turbo Series: Part # 039DD21132 (5.181” / 131.6mm)
Part # 038ADD750 75mm Stroke
Part # 038ADD790 79mm Stroke
Part # 038ADD830 83mm Stroke (For Stroker Custom Pistons Only)
* Custom made, Non-coated, not supplied with rings.
 
Subaru Impreza RS, Forester & Legacy EJ25 DOHC (1999 and up has 5.167" rod length)
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K599M995 $545 99.5/3.917 std 3.110 5.181 1.191 46.6 -23 8.5 .9055 1
Metric K599M9975 $545 99.75/3.927 .010 79 131.6 30.25 46.6 -23 8.5 23mm 1
  K599M100 $545 100/3.937 .020 79 131.6 30.25 46.6 -23 8.5 23mm 1
K1 Rods Available   Optional K1 Rods Available
Optional K1 Rod for EJ25 Non Turbo Series: Part # 039DD21132 (5.181” / 131.6mm)
Part # 038ADD750 75mm Stroke
Part # 038ADD790 79mm Stroke
Part # 038ADD830 83mm Stroke (For Stroker Custom Pistons Only)
 
Subaru EJ257 2.5L 16V WRX STI, 2004 and Up
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K598M995AP $545 99.5/3.917 Std. 3.110 5.137 1.209 51 -19 8.9 .9055 1
Metric K598M9975AP $545 99.75/3.927 .010 79 130.5 30.7 51 -19 8.9 23mm 1
  K598M100AP $545 100/3.937 0.020 79 130.5 30.7 51 -19 8.9 23mm 1
K1 Rods Available   Optional K1 Rods Available
K1 Rods Available   Optional K1 Cranks Available
Optional K1 Rod for EJ18/20/22/25/257 Series: Part # 039DD21131 (5.167” / 131.25mm)
Optional K1 Rod for EJ25 Non Turbo Series: Part # 039DD21132 (5.181” / 131.6mm)
K1 Crank Part # 039ADD750 75mm Stroke
K1 Crank Part # 039ADD790 79mm Stroke
K1 Crank Part # 039ADD830 83mm Stroke (For Stroker Custom Pistons Only)
All have: 8-Bolt Flanges * EJ20/25 Main & Rod Journals * 21 lbs.
 
Subaru Legacy Turbo 1991-94 EJ22
(96-98 Non Turbo 5.135 rod, 1999+ 5.165 rod)
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K601M975 $545 97.5/3.838 0.020 2.953 5.137 1.312 46.6 -20 8.5 .9055 1
Metric K601M98 Now $379.99,
On Sale in Overstock!
98/3.858 0.040 75 130.5 33.25 46.6 -20 8.5 23mm 1 Overstock
 
Subaru Hybrid EJ22 w/79mm Stroker Block, w/EJ25 DOHC Crank & Rods
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K602M975 $545 97.5/3.838 0.020 3.110 5.181 1.191 46.6 -24 8.5 .9055 1
Metric K602M98 $545 98/3.858 0.040 79 131.6 30.25 46.6 -24 8.5 23mm 1
 
NEW!!! Subaru FA20 2.0L BRZ, 2012 (also 4U-GSE, Scion FR-S & Toyota GT-86)
Piston # Price/
Set
Bore
MM/Inch
Oversizes Stroke Rod C.H. Head cc's Dome/Dish
Volume
Comp Ratio Pin
Dia.
Notes Buy Now
Inches K684M86AP $545 86.00 Std 3.385 5.091 1.285 39 -16 9.5 22mm 1
Metric     3.386 Std 86 129.3 32.64 39 -16 9.5      

Inches K685M86AP $545 86.00 Std 3.385 5.091 1.285 39 -9.5 10.5 22mm 1
Metric     3.386 Std 86 129.3 32.64 39 -9.5 10.5      
Notes:
* Non-coated, not supplied with rings (you can order RINGS separately here)
1
Most Wiseco Pistons have an offset pin. Pins must be offset same as OEM for quietest operation..
3  Optional pin upgrade available.
4 = This piston made w/stock compression height, which is very close to cylinder head. Use Cometic thick gasket if decking block.
A = Piston Rings need to be adjusted
B or *
= Will build to order (custom), Non-coated, not supplied with rings.
E = With valve pockets unline K557M series.
H = Based on Volvo rod 23mm. Ford OEM 21mm
R = Pin 20mm, OEM = 20.65mm (13/16)

Notes that apply to all Part #'s:
  • Some pistons are listed with a range of compression ratio's. The low number is determined w/an un-cut deck and the high number is determined w/.030 piston to cylinder head clearance.
  • Always check pistons to valve clearance - If using VTEC or like mechanisms- check w/longer duration higher lift lobe.
  • Always run at least .030 piston to head clearance including gasket thickness.
  • If piston appears to be different than expected, please do not hesitate to call Wiseco at 800-321-1364 to verify proper installation specifications.
 
 
 
 
 
Sales/Tech Line: (603) 378-0090
Email: info@ImportPerformanceParts.net


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*All prices on this site are subject to change without notice. Import Performance Parts™ disclaims responsibility for any printing or typographical errors, and does not guarantee that all information is accurate.


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