MAPerformance EJ25 Subaru WRX/STI Shortblock Assembly | Stage 1

EJ25 Subaru WRX/STI Shortblock Assembly | Stage 1 by MAPerformance

Modern Automotive Performance won't settle for anything less than the best when it comes to our engine-building program and our reputation. Only the best quality components along with specialized machining and assembly techniques for each individual platform are used to ensure the best possible performance and longevity. When it comes to Subaru engines, MAP makes no exceptions.

Please Note: This item does not qualify for free shipping. Shipping methods and charges will be determined when the service is completed. Please call for a shipping quote. Based on fluctuations in demand build times may vary throughout the year. Please contact a MAP sales representative for current estimations.

Features

• Included Services:
• Crankshafts are never cut/turned and receive a micro-polish treatment and balancing specifically for high-performance applications.
• The First step in the machining process is resurfacing. We pride ourselves on the surface finish (RA) we achieve as it is of the utmost importance in regards to head gasket sealing.
• Next, we bore the sleeves square to the deck surface. EJ25 specific torque plate is used to ensure roundness. The overbore is followed by a four-step plateau honing process that provides the absolute best cylinder wall finish and ultimate ring seating.
• Included Components:
• OEM Main and Rod Bearings (except for used cores which include ACL or King race series engine bearings, also available as an upgrade for new cores)
• Stock EJ25 Connecting Rods
• Forged Pistons
• Options:
• Crankshaft: We use standard size OEM crankshafts most frequently as we have not had a crankshaft failure to date. However, we realize that there are weight advantages and stroke options available with some aftermarket crankshafts so we will happily build your short block accordingly!
• Pistons: We offer our two most popular pistons Manley and Wiseco as options. If you would like to go with a different brand of pistons please give us a call.

Benefits

• Why Choose a MAP-built Engine?
• Crankshaft: We use standard size OEM crankshafts most frequently as we have not had a crankshaft failure to date. However, we realize that there are weight advantages and stroke options available with some aftermarket crankshafts so we will happily build your short block accordingly!
• Pistons: We offer our two most popular pistons Manley and Wiseco as options. If you would like to go with a different brand of pistons please give us a call.

Applications

• 2002-2018 Subaru WRX
• 2004-2021 Subaru WRX STI

What's In The Box?

• Services:
• 1 - Crankshaft micro-polish treatment and balancing
• 1 - Resurfacing
• 1 - Sleeve boring with four-step plateau honing
• Components:
• OEM Main and Rod Bearings (except for used cores which include ACL or King race series engine bearings, also available as an upgrade for new cores)
• Stock EJ25 Connecting Rods
• Forged Pistons
• Optional:
• Crankshaft: We use standard size OEM crankshafts most frequently as we have not had a crankshaft failure to date. However, we realize that there are weight advantages and stroke options available with some aftermarket crankshafts so we will happily build your short block accordingly!
• Pistons: We offer our two most popular pistons Manley and Wiseco as options. If you would like to go with a different brand of pistons please give us a call.