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EJ25 Performance Engine Parts

EJ25 Engine Parts

DOHC 16-valve turbo. Originally designed for the North American Impreza STI in 2004 with AVCS and DBW. The same short block as EJ255 except the EJ255 has a different domed piston vs the EJ257. The heads also have different components. Subaru of America designates the same part numbers for an EJ255 short block, and EJ257 short block with the exception of the pistons.

BrandPart NumberDescription
Pistons
Standard Engine - 79mm crankshaft - 5.137 rod length
Cosworth20003674 99.5mm bore - 79mm stroke - 5.137 rod length - 8.2:1 compression (STD) PISTONS RINGS NOT INCLUDED
Cosworth20003675 99.75mm bore - 79mm stroke - 5.137 rod length - 8.2:1 compression (.25mm overbore) PISTONS RINGS NOT INCLUDED
Cosworth20003676100mm bore - 79mm stroke - 5.137 rod length - 8.2:1 compression (.5mm overbore) PISTONS RINGS NOT INCLUDED
Cosworth20004531 99.5mm bore - 79mm stroke - 5.137 rod length - 9.2:1 compression (STD) PISTONS RINGS NOT INCLUDED
Cosworth20004532 99.75mm bore - 79mm stroke - 5.137 rod length - 9.2:1 compression (.25mm overbore) PISTONS RINGS NOT INCLUDED
Cosworth20004533100mm bore - 79mm stroke - 5.137 rod length - 9.2:1 compression (.5mm overbore) PISTONS RINGS NOT INCLUDED
ManleyMAN-612000CA-199.5mm Grade A - "True Drop In"- 79mm stroke - 5.137 rod length - 8.5:1 compression (STD)
ManleyMAN-612000CB-199.5mm Grade B - "True Drop In"- 79mm stroke - 5.137 rod length - 8.5:1 compression (STD)
ManleyMAN-612000C-4 99.5mm bore - 79mm stroke - 5.137 rod length - 8.5:1 compression (STD)
ManleyMAN-612001C-4 99.55mm bore - 79mm stroke - 5.137 rod length - 8.5:1 compression (.025mm overbore)
ManleyMAN-612002C-4 99.75mm bore - 79mm stroke - 5.137 rod length - 8.5:1 compression (.25mm overbore)
ManleyMAN-612005C-4100mm bore - 79mm stroke - 5.137 rod length - 8.5:1 compression (.5mm overbore)
ManleyMAN-612100C-4 99.5mm bore - 79mm stroke - 5.137 rod length - 9.8:1 compression (STD)
ManleyMAN-612102C-499.75mm - 79mm stroke - 5.137 rod length - 9.8:1 compression (.25mm overbore)
ManleyMAN-612105C-4100mm - 79mm stroke - 5.137 rod length - 9.8:1 compression (.5mm overbore)
SupertechSUP-P4-SU9950-N2099.5mm bore - 79mm stroke - 5.137 rod length - 8.2:1 compression (STD)
SupertechSUP-P4-SU100-N20B100mm bore - 79mm stroke - 5.137 rod length - 8.2:1 compression - PISTONS RINGS NOT INCLUDED (.5mm overbore)
SupertechSUP-P4-SU9950-N199.5mm bore - 79mm stroke - 5.137 rod length - 10.5:1 compression - PISTONS RINGS NOT INCLUDED (STD)
WisecoWIS-K598M99599.5mm bore - 79mm stroke - 5.137 rod length - 8.9:1 compression (STD)
WisecoWIS-K598M997599.75mm bore - 79mm stroke - 5.137 rod length - 8.9:1 compression (.25mm overbore)
WisecoWIS-K599M100100mm bore - 79mm stroke - 5.137 rod length - 8.9:1 compression (.5mm overbore)
De-stoked Engine - 75mm crankshaft - 5.137 rod length
ManleyMAN-621000C-4 99.5mm bore - 75mm stroke - 5.137 rod length - 8.5:1 compression (STD)
ManleyMAN-621002C-499.75mm bore - 75mm stroke - 5.137 rod length - 8.5:1 compression (.25mm overbore)
ManleyMAN-621005C-4100mm bore - 75mm stroke - 5.137 rod length - 8.5:1 compression (.5mm overbore)
ManleyMAN-621100C-4 99.5mm bore - 75mm stroke - 5.137 rod length - 9.8:1 compression (STD)
ManleyMAN-621102C-499.75mm bore - 75mm stroke - 5.137 rod length - 9.8:1 compression (.25mm overbore)
ManleyMAN-621105C-4100mm bore - 75mm stroke - 5.137 rod length - 98:1 compression (.5mm overbore)
Stroker Engine - 83mm crankshaft - 5.137 rod length
ManleyMAN-622000C-4 99.5mm bore - 83mm stroke - 5.137 rod length - 8.5:1 compression (STD)
ManleyMAN-622002C-499.75mm bore - 83mm stroke - 5.137 rod length - 8.5:1 compression (.25mm overbore)
ManleyMAN-622005C-4100mm bore - 83mm stroke - 5.137 rod length - 8.5:1 compression (.5mm overbore)
ManleyMAN-622100C-4 99.5mm bore - 83mm stroke - 5.137 rod length - 9.8:1 compression (STD)
ManleyMAN-622102C-499.75mm bore - 83mm stroke - 5.137 rod length - 9.8:1 compression (.25mm overbore)
ManleyMAN-622105C-4100mm bore - 83mm stroke - 5.137 rod length - 98:1 compression (.5mm overbore)
Wrist Pin Upgrade
ManleyMAN-42546-49310 Heavy-duty piston wrist pin upgrade (works with most brand pistons)
Piston Rings
Cosworth20001515Complete set (4) - 99.50mm Ring Set
Cosworth20001516Complete set (4) - 99.75mm Ring Set
Cosworth20001517Complete set (4) -100.0mm Ring Set
ManleyMAN-46995-4Complete set (4) - 99.50mm Ring Set
ManleyMAN-46997-4Complete set (4) - 99.75mm Ring Set
ManleyMAN-461000-4Complete set (4) -100.0mm Ring Set
SupertechSUP-SWF-2006899.50mm Ring Set (1 Piston)
SupertechSUP-SWF-20068-2100.0mm Ring Set (1 Piston)
WisecoWIS-9950VF99.50mm Ring Set (1 Piston)
WisecoWIS-99750VF99.75mm Ring Set (1 Piston)
WisecoWIS-10000VF100.0mm Ring Set (1 Piston)
Rods
Brian CrowerBC6609BC Sportsman H beam - 5.137 rod length - 3/8" ARP 2000 Bolts
Brian CrowerBC6608BC Sportsman H beam - 5.137 rod length - 3/8" ARP 625+ Bolts
Brian CrowerBC6607BC I beam - 5.137 rod length - 3/8" ARP 2000 Bolts
Brian CrowerBC6606BC I beam - 5.137 rod length - 3/8" ARP 625+ Bolts
Cosworth20002587Cosworth H beam - 5.137 rod length - WMC Bolts
EagleEGL-CRS5137S3DEagle H beam connecting rods - 5.137 rod length - 3/8" ARP 2000 Bolts
K1 TechnologiesK1T-SH5137AJJB4-AK1 Technologies H beam connecting rods - 5.137 rod length - 3/8" ARP 2000 Bolts
ManleyMAN-14024-4Manley H beam connecting rods - 5.137 rod length - 3/8" ARP 2000 Bolts - MOST POPULAR
ManleyMAN-15024-4Manley H TUFF connecting rods - 5.137 rod length - 3/8" ARP 2000 Bolts (stronger version of the classic h beam)
ManleyMAN-14024R6-4Manley H beam connecting rods - 5.137 rod length - 3/8" ARP 625+ Bolts
ManleyMAN-15024R6-4Manley H TUFF connecting rods - 5.137 rod length - 3/8" ARP 625+ Bolts (stronger version of the classic h beam)
ManleyMAN-14416-4Manley Turbo Tuff I beam connecting rods - 5.137 rod length - 3/8" ARP 2000 Bolts
PauterPAU-SUB-230-510-1315FPauter X Beam connecting rods - 5.137 rod length - 3/8" ARP 2000 Bolts
Connecting Rod Bolts
ARPARP-260-6302ARP 8740 chrome moley connecting rod bolts for STOCK EJ257/255 connecting rods
Crankshafts
Brian CrowerBC56094340 billet crankshaft - 79mm stroke (STD)
Brian CrowerBC56294340 billet crankshaft - 83mm stroke (Stroker)
Cosworth 20002315EN40B steel billet crankshaft - 79mm stroke (STD)
Cosworth20002316EN40B steel billet crankshaft - 81mm stroke (Stroker)
K1 TechnologiesK1T-S750EJ20D4340 billet crankshaft - 75mm stroke (Destroke)
K1 TechnologiesK1T-S790EJ25D4340 billet crankshaft - 79mm stroke (STD)
K1 TechnologiesK1T-S830EJ25D4340 billet crankshaft - 83mm stroke (Stroker)
ManleyMAN-190160B4340 billet crankshaft - 75mm stroke (Destroke)
ManleyMAN-190040B4340 billet crankshaft - 79mm stroke (STD)
ManleyMAN-190060B4340 billet crankshaft - 83mm stroke (Stroker)
Subaru OEMSUBOEM-12200AA240OEM Subaru 75mm crankshaft (05 WRX) (Destroke)
Subaru OEMSUBOEM-12200AA330 OEM Subaru 79mm heat treated crankshaft (new STI) (STD)
Engine Bearings
ACLAEB-4B8296HACL Race - Connecting rod bearing - EJ20/25 - 52mm Journal (all 02+ WRX/STI)
ACLAEB-4B8296HXACL Race - Connecting rod bearing - EJ20/25 - 52mm Journal (all 02+ WRX/STI) - HX SIZED .001 EXTRA CLEARANCE
ACLAEB-5M8309HACL Race - Main bearing - EJ20/25 - Thrust position 5 (all 02+ WRX/STI)
ACLAEB-5M8309HXACL Race - Main bearing - EJ20/25 - Thrust position 5 (all 02+ WRX/STI) - HX SIZED .001 EXTRA CLEARANCE
KingKNG-CR4125XPGKing Tri-Metal Perf - Connecting rod bearing - EJ20/25 - 52mm Journal (all 02+ WRX/STI)
KingKNG-MB5382XPGKing Tri-Metal Perf - Main bearing - EJ20/25 - Thrust position 5 (all 02+ WRX/STI)
Harmonic Damper
FluidamprFLD-531101Street series harmonic damper
ATI917991Super Harmonic Damper
Head/Main Studs
ARPARP-260-4701ARP DOHC Head Stud Kit
ARPARP-L19-EJARP L19 Head Stud Kit
ARPARP-260-4704ARP DOHC Custom Age Head Stud Kit (High HP)
ARPARP-260-5401ARP Main Bolts (Block/Case bolts)
Cosworth20002440Cosworth Ultra-High Performance Head Stud Kit - H11 material
CosworthPR7426Cosworth Main Bolts (Block/Case bolts)
Headgasket/Gasket Kits
CometicC4264-027100mm Bore/ .027in
CometicC4264-030100mm Bore/ .030in
CometicC4264-040100mm Bore/ .040in
Cosworth2000091304-07 - Bore = 101mm T ~ .78mm each
Cosworth2000091604-07 - 101mm T ~ 1.1mm each
Cosworth2000214504-07 - 101mm T ~ 1.5mm each
Cosworth2001070608+ - 101mm T ~ .78mm each
Cosworth2001070708+ - 101mm T ~ 1.1mm each
Cosworth2001070808+ - 101mm T ~ 1.5mm each
Subaru OEMSUBOEM-11044AA642OEM Subaru heagasket - All STI models build dates 1/04-6/06
Subaru OEMSUBOEM-11044AA770OEM Subaru heagasket - 2.5L WRX build dates 4/05-6/07 and 6/06-6/07 STI
Complete gasket kits (does not include exhaust gaskets)
Subaru OEMSUBOEM-10105AB010OEM Subaru master gasket set - 06-07 WRX kit
Subaru OEMSUBOEM-10105AA590OEM Subaru master gasket set - 04-06 STI kit
Subaru OEMSUBOEM-10105AB080OEM Subaru master gasket set - 07 STI kit
Camshafts
Single AVCS (EJ257)
Single (intake) AVCS - EJ257 - 04-07 STi & 06-07 WRX Camshafts
Brian CrowerBC0621Stage 2 - duration 272/272 - lift 10.16/10.16
Brian CrowerBC0622Stage 3 - duration 280/280 - lift 10.80/10.80
CosworthKK3766Stage 2 - duration 278/274 - lift 10.70/10.0
GSCGSC-6025S1Stage 1 - duration 268/266 - lift 10.80/10.40 (stock turbo or up to 500WHP)
GSCGSC-6025S2Stage 2 - duration 272/272 - lift 10.50/10.20 (500-750hp) - MOST POPULAR
GSCGSC-6025S3Stage 3 - duration 282/282 - lift 11.30/11.30 (High HP drag racing)
KelfordKEL-R-199-AStage Stock+ - duration 256/260 - lift 9.55/9.50 (stock turbo/rally)
KelfordKEL-R-199-BStage 1 - duration 264/260 - lift 10.70/10.20 - (300-500hp range)
KelfordKEL-R-199-CStage 2 - duration 272/268 - lift 11.30/10.50 - (500-700hp range)
KelfordKEL-R-199-DStage 3 - duration 280/278 - lift 11.55/11.0 (High HP drag racing)
2008+ STI (EJ257B) Dual AVCS - EJ257B - 08+ STi
Brian CrowerBC0623Stage 2 Camshafts - duration 272/272 - lift 10.16/10.16
Brian CrowerBC0624Stage 3 Camshafts - duration 280/280 - lift 10.80/10.80
Cosworth20007395Stage 2 Camshafts - duration 278/274 - lift 10.70/10.0
GSCGSC-6026S1Stage 1 Camshafts - duration 266/264 - lift 10.70/10.40 (stock turbo or up to 500WHP)
GSCGSC-6026S2Stage 2 Camshafts - duration 272/272 - lift 10.70/10.40 (500-750hp) - MOST POPULAR
KelfordKEL-220-AStage Stock+ Camshafts - duration 264/260 - lift 10.70/10.20 (stock turbo/rally)
KelfordKEL-220-BStage 1 Camshafts - duration 264/260 - lift 10.70/10.20 (300-500hp range)
KelfordKEL-220-CStage 2 Camshafts - duration 272/268 - lift 11.30/10.50 (500-700hp range)
KelfordKEL-220-DStage 3 Camshafts - duration 282/278 - lift 11.50/11.0 (High HP drag racing)
Springs/Retainer Kits
Brian CrowerBC0600Single spring, titanium retainer kit (Seat: 1.420" @ 80 lbs / Open: 1.000" @ 178 lbs / Coil Bind: 0.850")
Brian CrowerBC0600SSingle spring, steel retainer kit (1.420" @ 80 lbs / Open: 1.000" @ 178 lbs / Coil Bind: 0.850")
Brian CrowerBC0610Single spring, steel retainer, steel seat kit (Seat: 1.325" @ 82 lbs / Open: 0.925" @ 180 lbs / Coil Bind: 0.730")
CosworthKK3839Dual spring, titanium Retainer kit (Ultra-High RPM)
GSCGSC-5743Single spring, titanium retainer kit (75lbs @ 1.376" / 195lbs @ 11mm lift) POPULAR
GSCGSC-5043Beehive single spring, titanium retainer kit (Seat: 85 lbs @ 1.369" (34.8mm) / 225lbs @.433" (11mm) / Coil bind @ .550" (14mm)) POPULAR
KelfordKEL-KVS1847-BTBeehive single spring, titanium retainer kit (Seat: 105lb @ 36.00mm installed height / Coil bind @ 23.00mm / 12.00mm maximum lift)
ManleyMAN-26180Single spring, titanium retainer kit (Seat: @ 60 @ 1.420" / Open: @ 151 @ 1.050" - 187 @ .895" / Max Lift .525" / Coil Bind @ .845") POPULAR
ManleyMAN-26185Beehive single spring, titanium retainer kit (Seat: @ 95 @ 1.420" / Open: @ 217 @ 1.050" / 257 @ .930" / Max Lift .490" / Coil Bind .880")
SupertechSUP-SPRK-TS1015_SU1Dual spring, titanium Retainer kit (70 @ 35.5mm) - MOST POPULAR
Valve Springs (ONLY)
Cosworth20000166High RPM Single Valve Spring set
KelfordKEL-KVS109-STiHigh RPM Single Valve Spring set
Valves
Brian CrowerBC3600Complete set (8) - 36.0mm Intake - Stainless - (STD)
Brian CrowerBC3601Complete set (8) - 32.0mm Exhaust - Stainless - (STD)
Brian CrowerBC3604Complete set (8) - 37.0mm Intake - Stainless - (+1mm Oversize)
Brian CrowerBC3605Complete set (8) - 33.0mm Exhaust - Stainless - (+1mm Oversize)
CosworthSB0034Complete set (8) - 37.0mm Intake - Stainless - (+1mm Oversize)
CosworthSB0033Complete set (8) - 33.0mm Exhaust - Inconel - (+1mm Oversize)
GSCGSC-2011-8Complete set (8) - 36.0mm Exhaust - 21-4N material Black Nitride - (STD)
GSCGSC-2012-8Complete set (8) - 32.0mm Intake - 23-8N material Black Nitride - (STD)
GSCGSC-2013-8Complete set (8) - 37.0mm Intake - 21-4N material Black Nitride - (+1mm Oversize)
GSCGSC-2014-8Complete set (8) - 33.0mm Exhaust - 23-8N material Black Nitride - (+1mm Oversize)
GSCGSC-2011-1Single (1) - 36.0mm Intake - 21-4N material Black Nitride - (STD)
GSCGSC-2012-1Single (1) - 32.0mm Exhaust - 23-8N material Black Nitride - (STD)
GSCGSC-2013-1Single (1) - 37.0mm Intake - 21-4N material Black Nitride - (+1mm Oversize)
GSCGSC-2014-1Single (1) - 33.0mm Exhaust - 23-8N material Black Nitride - (+1mm Oversize)
ManleyMAN-11138-8Complete set (8) - 36.0mm Intake - Stainless - (STD)
ManleyMAN-11155-8Complete set (8) - 32.0mm Exhaust - Stainless - (STD)
ManleyMAN-11137-8Complete set (8) - 32.0mm Exhaust - Xtreme Duty - (STD)
ManleyMAN-11140-8Complete set (8) - 37.0mm Intake - Stainless - (+1mm Oversize)
ManleyMAN-11171-8Complete set (8) - 33.0mm Exhaust - Stainless - (+1mm Oversize)
ManleyMAN-11139-8Complete set (8) - 33.0mm Exhaust - Xtreme Duty - (+1mm Oversize)
SupertechSUP-SIVN-1010Single (1) - 36.0mm Intake - Stainless Black Nitride - (Order 8 per car) - (STD) - POPULAR
SupertechSUP-SEVN-1010Single (1) - 32.00mm Exhaust - Stainless Black Nitride - (Order 8 per car) - (STD) - POPULAR
SupertechSUP-SEVI-1010Single (1) - 32.00mm Exhaust - Inconel (Heavy duty) - (Order 8 per car) - (STD) - POPULAR
SupertechSUP-SIVN-1012_2Single (1) - 36.50mm Intake - Stainless Black Nitride - (Order 8 per car) - (STD)
SupertechSUP-SEVN-1012_2Single (1) - 32.50mm Exhaust - Stainless Black Nitride - (Order 8 per car) - (STD)
SupertechSUP-SEVI-1012_2Single (1) - 32.50mm Exhaust - Inconel (Heavy duty) - (Order 8 per car) - (STD)
SupertechSUP-SIVN-1014_2Single (1) - 37.0mm Intake - Stainless Black Nitride - (Order 8 per car) - (STD)
SupertechSUP-SEVN-1014_2Single (1) - 33.0mm Exhaust - Stainless Black Nitride - (Order 8 per car) - (STD)
SupertechSUP-SEVI-1014_2Single (1) - 33.0mm Exhaust - Inconel (Heavy duty) - (Order 8 per car) - (STD)
Valve Locks (Keepers)
Brian CrowerBC2960 6° Billet Keepers / Locks (32 pieces - complete set)
Valve Guides
Brian CrowerBC3960Complete set (8) intake valve guide
Brian CrowerBC3961Complete set (8) exhaust valve guide
SupertechSUP-GDE-SUEJ6-ESingle (1) exhaust valve guide (Order 8 per motor)
SupertechSUP-GDE-SUEJ6-ISingle (1) intake valve guide (Order 8 per motor)
GSCGSC-3025-8Complete set (8) exhaust valve guide w/ depth stopper
GSCGSC-3026-8Complete set (8) intake valve guide w/ depth stopper
GSCGSC3027-8Complete set (8) exhaust valve guide w/ traditional
GSCGSC3028-8Complete set (8) intake valve guide w/ traditional
Valve Seals
GSCGSC-1022Complete set (16) intake/exhaust valve seals
SupertechSUP-VS-TS6-ESingle (1) exhaust valve seal (Order 8 for per motor)
SupertechSUP-VS-TS6-ISingle (1) intake valve seal (Order 8 for per motor)
Timing Kits/Belts Timing belts ONLY
GatesGAT-T328RBKevlar reinforced racing timing belt - (blue color)
GatesGAT-T328OEM Grade timing belt - (black color)
Cosworth20004953Kevlar reinforced racing timing belt - (blue color)
HKSHKS-24999-AF001Kevlar reinforced racing timing belt - (purple color)
Timing belt kits
GatesGAT-TCKWP328Complete timing belt kit including belt, all pulleys, gear, tensioner and water pump (OEM grade black timing belt)
GatesGAT-TCKWP328RBComplete timing belt kit including belt, all pulleys, gear, tensioner and water pump (Racing timing belt blue color)
GatesGAT-TCK328Timing belt kit including belt, all pulleys, gear, tensioner - NO water pump (OEM grade black timing belt)
GatesGAT-TCK328RBTiming belt kit including belt, all pulleys, gear, tensioner - NO water pump (Racing timing belt blue color)
Timing belt guides
CosworthSB0001Billet Timing Belt Guide
Torque SolutionsTS-SU-010Billet Timing Belt Guide
Accessory Belts
GatesGAT-K040353RBA/C Belt (blue color)
GatesGAT-K050345RBAlternator & Power Steering Belt (blue color)
Water Pump
GatesGAT-43548Gates Water Pump
Thermostat
MishimotoMSH-MMTS-WRX-0160 Degree racing thermostat
Subaru OEMSUBOEM-21200AA072 OEM Subaru thermostat
Oil Pumps
ACLAEB-OPSB1478HPOrbit Performance Oil Pump
CosworthKK3928Blueprinted Oil Pump-w/ High Pressure Mod & Install Kit
Cosworth20001185High Volume/Pressure Blueprinted Oil Pump & install Kit
Subaru OEMSUBOEM-15010AA360OEM Subaru 11mm (2008+ STI) oil pump - MOST POPULAR
Oil Control
Cosworth20002499Oil Control Baffle
Killer B MotorsportKLR-EJ25PanHigh Performance Oil Pan
Killer B MotorsportKLR-EJ25P-PHigh Performance Oil Pan & oil pickup combo
Killer B MotorsportKLR-EJ25P-BHigh Performance Oil Pan & oil baffle combo
Killer B MotorsportKLR-PPBCHigh Performance Oil Pan, oil baffle, oil pickup combo (Ultimate duty)
Killer B MotorsportKLR-070-110Ultimate oil pickup (EJ25)
Killer B MotorsportKLR-OPBUltimate oil pickup (EJ25) & oil baffle combo
Killer B MotorsportKLR-EJWTOil Baffle Windage Tray
Lubricants
RedlineRDL-80319 Liquid Engine Assembly Lube (12oz)
ARPARP-100-9908Ultra Torque Assembly Lube - .50oz packet
ARPARP-100-9909Ultra Torque Assembly Lube - 1.69 oz Tube
MotulMOT-2810QTA 5W40 Engine break in oil
MotulMOT-1031325W40 - POWER - 300V Engine oil (highly recommended)
MotulMOT-1027845W40 - 8100 X-cess Engine oil
Subaru OEMSUBOEM-004403007 Subaru OEM Super Three Bond 1215 (Subabond) Tube (Sealant for block halves, oil pump etc)
Air Induction
Cosworth20006438High flow intake manifold - DBW only
Skunk2SK2-309-12-210072mm Billet Throttle Body - DBW only
Spark Plugs
NGKNGK-6619Stock heat range iridium spark plugs (sold invidually (1)) - LFR6AIX-11
NGKNGK-2309One (1) heat range colder iridium spark plugs (sold invidually (1)) - LFR7AIX
LEFT COLUMN
RIGHT COLUMN