The Ultimate STI Hatch : Steve's Comprehensive WRX STI Build

IAG 750 Stage 2.5

Steve's 2010 Subaru WRX STI Hatch runs on an IAG 750 Closed Deck Short Block, a hardcore upgrade for anyone chasing serious power. With reinforced cylinder walls and precision engineering, it’s the answer to blown head gaskets and cracked blocks under extreme boost.

Key Features:

• Closed Deck Design: Reinforces cylinder walls to handle high boost and prevent flex or cracking. Forged Pistons: 2618 T6 aluminum pistons designed to withstand massive cylinder pressure.
• Beefy Rods: H-Beam connecting rods with ARP 2000 bolts built for durability at high RPMs.
• Strengthened Crankshaft: A nitrided STI crankshaft that reduces wear and ensures smooth operation.
• Reliable Bearings: ACL or King Race bearings keep everything spinning without fail.

Rated for 750 BHP, the IAG 750 provides a bulletproof foundation for any high-performance Subaru build. Installed by us at Lakeview Automotive, it’s the perfect blend of power and reliability for street or track.

FP Black Turbo

Steve's, 2010 Subaru WRX STI Hatch is equipped with the Forced Performance FP Black Turbo, a stock-location powerhouse designed for high-output builds. With exceptional airflow, minimal lag, and support for 575 wheel horsepower, it’s an ideal turbo for serious Subaru enthusiasts.

Key Features:

• Billet Compressor Wheel: Flows 71 lbs/min, combining fast spool with exceptional top-end power.
• Stock-Location Fitment: Bolts directly to factory turbo mounts, simplifying installation.
• 84mm Turbine Wheel: Optimizes exhaust flow for high-boost efficiency and reduced backpressure.
• High-Temperature Durability: Built with premium materials to withstand extreme conditions.

In Steve’s build, paired with the IAG 750 Block, AMS Intake Manifold, and ID1700 Injectors, the FP Black delivers 544 WHP and 467 ft-lb of torque, making it a responsive yet ferociously powerful addition to the STI’s arsenal.

AMS Performance Intake Manifold

Steve's 2010 Subaru WRX STI Hatch features the AMS Performance EJ Intake Manifold, designed to maximize airflow and unlock the engine’s full potential. Engineered for high-performance builds, this manifold delivers consistent power and improved throttle response across the RPM range.

Key Features:

• Large 4.5-Liter Plenum: Provides ample air reserve for sustained high-RPM power.
• Equal-Length 13-Inch Runners: Ensures balanced airflow to all cylinders for efficient combustion and smooth power delivery.
• Integrated TGV Housing Replacement: Eliminates turbulence with a direct, long-runner design to enhance airflow efficiency.
• Supports Larger Throttle Bodies: Compatible with throttle bodies up to 70mm with minor porting for increased air intake capacity.

Paired with the FP Black Turbo and IAG 750 Block, the AMS Intake Manifold plays a vital role in Steve’s build, helping the STI achieve its impressive power and maintaining drivability under high-performance conditions.

IAG Fuel Kit with ID1700 Injectors

Integral to the performance of Steve's 2010 Subaru WRX STI Hatch is the IAG Fuel Kit, featuring ID1700 injectors that ensure optimal fuel delivery for the engine’s upgraded components.

Key Features:

• High-Flow Injectors: The ID1700 injectors are designed to deliver up to 1,700cc of fuel per minute, providing ample fuel supply even at high boost levels, essential for maximizing horsepower.
• Precision Engineering: These injectors feature a proprietary design for accurate fuel atomization, improving combustion efficiency and overall power output.
• Compatible with E85: Designed to work seamlessly with various fuel types, including E85, the ID1700 injectors support tuned applications aimed at achieving maximum performance.

By incorporating the IAG Fuel Kit with ID1700 injectors, Steve’s STI ensures that the engine receives the necessary fuel to achieve its full potential..

Invidia Downpipe and Equal Length Headers

Enhancing the performance of Steve's 2010 Subaru WRX STI Hatch are the Invidia Downpipe  and Equal Length Headers, engineered to optimize exhaust flow and boost engine output.

Key Features:

• Invidia Downpipe: Constructed from SUS304 stainless steel, this high-flow downpipe reduces exhaust backpressure, facilitating quicker turbo spool and improved throttle response. Its design enhances the exhaust note, adding an aggressive tone to the driving experience.
• Equal Length Headers: Featuring an equal-length design with 1.65-inch diameter runners, these headers ensure balanced exhaust flow, improving turbo efficiency and providing smoother power delivery across the RPM range. This configuration minimizes turbo lag, allowing the engine to reach boost more rapidly.
• Durable Construction: Both components are fabricated from high-quality 304 stainless steel, ensuring longevity and reliable performance under extreme conditions.

Together, the Invidia Downpipe and Equal Length Headers create an efficient exhaust pathway, enabling Steve’s STI to expel those exhaust gases more efficiently.

GSC S1 Camshafts and GSC Beehive Valves Springs

A pivotal enhancement in Steve's 2010 Subaru WRX STI Hatch is the integration of GSC Power-Division S1 Camshafts, complemented by upgraded valve train components, meticulously engineered to optimize engine performance and efficiency.

Key Features:

• GSC S1 Camshafts: Designed to increase airflow at higher RPMs, these camshafts enable the engine to breathe more effectively, significantly boosting power output. They are crafted to provide a smooth idle and exceptional top-end performance, making them ideal for street and track applications.
• GSC Beehive Valve Springs: These lightweight and durable springs offer reliable valve control at elevated RPMs, reducing the risk of valve float and ensuring consistent performance. Their unique beehive design allows for higher engine speeds without compromising reliability.
• Titanium Retainers: Utilized to decrease weight in the valve train, titanium retainers enhance responsiveness and permit higher engine speeds, all while maintaining durability.

Collectively, the GSC S1 camshafts and accompanying valve train upgrades harness the full potential of the EJ257 engine, contributing to a smoother power band and delivering an exhilarating driving experience in Steve’s STI.

RAYS CE28 Wheels

The Rays CE28N wheels on Steve's 2010 Subaru WRX STI Hatch are a standout feature, offering the perfect balance of performance and style.

• Lightweight Design: Forged from a single piece of aluminum, the CE28N wheels are engineered for exceptional strength-to-weight efficiency. This lightweight construction reduces unsprung weight, enhancing handling, acceleration, and cornering responsiveness.
• 10-Spoke Aesthetic: The iconic 10-spoke design not only contributes to weight savings but also delivers a clean, aggressive look that perfectly complements high-performance builds.
• Motorsport Proven: Designed with input from racing, these wheels are built to excel on the street and the track, making them an ideal choice for enthusiasts seeking both form and function.

With the CE28N wheels, Steve’s STI gains a sharper, more agile feel and a bold visual upgrade, showcasing the thoughtfulness behind every aspect of his build. *We are now officially a Rays Wheels Dealer!*

Seibon Carbon Fiber

Steve's 2010 Subaru WRX STI Hatch is outfitted with Seibon carbon fiber components, delivering weight reduction, improved aerodynamics, and an unmistakably aggressive look.

• Extensive Carbon Fiber Upgrades: Featuring a hood, front fenders, rear hatch, rear spoiler, front lip, grille, side skirts, rear diffuser, and bumper vents, these components shed weight across the car for sharper handling and improved balance.
• Aerodynamic Enhancements: The front lip, diffuser, and bumper vents optimize airflow, reduce drag, and increase downforce, boosting performance at high speeds.
• Signature Style: The carbon fiber weave adds a race-inspired aesthetic that complements the car’s powerhouse build, ensuring it looks as fast as it drives.

With these Seibon upgrades, Steve’s STI combines lightweight engineering and bold design, creating a high-performance machine that turns heads and dominates the road.