Subaru
Sport Compact Piston Kits

• Always check piston 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 Performance Auto Parts at 888-732-1595 to verify compatibility.

WRX EJ20 October 1998 and older Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K576M925 K576M93 $524	92.50 93.00	.020 .040	2.952	5.137	1.312	-17.8	-	350 356 _	1,2	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.

WRX October 1998 and newer Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K588M92 K588M925 K588M93 $524	92.00 92.50 93.00	Std .020 .040	2.952	5.137	1.286	-9	8.35	375 380 385	1	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.

WRX EJ20 Stroker Pre October 1998 ( Sleeved blocks without access holes) Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K579M925 K579M93 $524	92.50 93.00	.020 .040	3.110	5.177	1.181	-17.8	8.5	339 348	1,6	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.
• 6. These pistons have an oil ring groove that is lower than OE. Will not work with sleeves with access hole if the oil ring is not pinned in place.

Imprezza RS, Forrester and Legacy FJ25 SOHC Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K600M995 K600M100* $524	99.50 100.0	Std .020	3.110	5.181	1.161	-18	8.5	366 371	1	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.

Imprezza RS, Forrester and Legacy FJ25 DOHC (1999 and up has 5.167" rod length) Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K599M995 K599M100 $524	99.50 100.0	Std .020	3.110	5.167	1.191	-23	8.5	361 366	1	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.

WRX STI 2004 and up EJ257 Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K598M995 K598M100 $524	99.50 100.0	Std .020	3.110	5.137	1.209	-19	8.9	371 376	1	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.

Legacy Turbo 1991-1994 EJ22 Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K601M975 K601M98 $524	97.50 98.00	.020 .040	2.953	5.137	1.312	-20	8.5	358 366	1,2	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.

Hybrid EJ22 with EJ25 DOHC Crank & Rods Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
Part #	Bore	Over Size	Stroke	Rod Lgth	Comp. Ht.	Piston cc's	Comp. Ratio	Gram	Foot Notes	Purchase Online!
K602M975 K602M98* $524	97.50 98.00	.020 .040	3.110	5.181	1.191	-24	8.5	358 366	1,2	Discounted Prices!

• Footnotes:
• 1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).
• 2. Due to a compression height that may protrude above the deck, it is recommended that a .040" thick head gasket is used.