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AEM Water-Methanol Injection kit
The AEM Water Injection Kit is a safe and economical way to reduce air
inlet temperatures to increase boost pressure for more power.
Lower air inlet temperatures allow users to advance timing without having to
run higher-octane fuel. This is the most ...
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Agency Alternator Cover - WRX STi 08-09
This cover helps dress up the engine bay with some needed style in Satin Silver or Wrinkle Red.
TECH TIP: The cover includes riser spacers and fits with the factory bolt locations. All other hardware is provided for a quick and easy installa...
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Agency Cold Air Intake Kit - WRX STi 08-09
Tested on a Mustang all wheel drive dyno, the Agency Power intake kit was installed on a 2008 Subaru WRX Sedan. The kit gained approximately 10 horsepower and ft/lbs of torque. At the peak horsepower point of 5000 rpm’s, the intake kit made almost 20 wheel horsepower.
The kit featu...
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Agency Power Fuel Rail Kit - Subaru STI 07-09
The factory system runs the fuel in series which tends to cause certain cylinders to obtain less fuel. In higher boost applications, these cylinders can lean out dangerously causing the motor to fail.
Our Price: $364.95
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Agency Short Ram Intake Kit - Subaru STi 08-10
This intake kit gained approximately 10 horsepower and ft/lbs of
torque. At the peak horsepower point of 5000 rpm's, the intake kit made
almost 20 wheel horsepower.
The kit features a CNC aluminum MAF sensor mount on our intake tube with built in fins to keep air flow laminar. Th...
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AMS Fuel Pressure Regulator Kit - STi 08+
The AMS 08+ Subaru STI Fuel Pressure Regulator Kit is designed for anyone running an upgraded fuel pump and or fuel injectors. Whether you are running too rich and need to back off the fuel pressure or if you are running too lean on your current injectors and need to raise base fuel pressure, thi...
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AMS Small Battery Kit - STi 08+
The AMS 08+ WRX/STI Small Battery Kit replaces your heavy factory battery with a lightweight race battery. This kit significantly reduces weight and frees up space. Our high quality components guarantee long life and the battery itself will have no trouble starting your vehicle in harsh condit...
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AMS Small Battery Tray - STi 08+
The AMS 08+ STI/WRX Small Battery Tray allows you to replace the heavy factory battery and mount with a lightweight race battery mounted on its side. The tray is TIG welded by hand using high grade aluminum and the battery is topped off with a CNC'd AMS tie down plate. All factory mounting ...
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ARP Main Studs - Subaru STI 08-10
ARP Subaru STI EJ257 Main Bolts are crafted from 8740 forged chrome moly and feature generous under-head radius and rolled threads for excellent reliability.
Our Price: $402.95
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Boost Juice 4 Gallon Case
Boost Juice™ is Snow Performance’s proprietary mix of 49% methanol and 51% water.
It is made in a controlled environment with special care to make sure the ratios are accurate to result in a high performance water-methanol fluid formulated for use in the Boost Cooler™ injection sys...
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Bosch 044 Fuel Pump
The Bosch 044 fuel pump provides 300LPH of flow and operates at an amazing 72.5PSI.
Bosch 044 fuel pumps are comparable to the Walbro 255LPH high pressure
inline fuel pumps which can both support vehicles for up to 600-700
horse power.
Can be used in sequ...
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Brian Crower Stage 2 Set of 4 Cams - STi 08-10
Brian Crower high performance billet camshafts are CAD designed to optimize torque & horsepower throughout the power band.
Duration: 272/272
Duration @.050: 220/220
Lift: .400” /.400”
TECH TIP: Plug and pl...
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Brian Crower Stage 3 Set of 4 Cams - STi 08-10
Brian Crower high performance billet camshafts are CAD designed to optimize torque & horsepower throughout the power band.
Duration: 280/280
Duration @.050: 234/234
Lift: .425” /.425”
Fits: Subaru STi...
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Cobb Tuning AccessPort: Subaru Impreza STi 2008-2010
The ultimate personal tuning solution for your 2008-2010 STi!
Reprogram your vehicle's computer (ECU) by selecting one of the pre-installed performance "maps" that automatically optimize settings such as the air/fuel ratio, ignition timing, boost and more for performance r...
Our Price: $595.00
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Cosworth Camshaft set, 2008+ Subaru STI - STi 08-09
Cosworth has been engineering camshafts for nearly 50 years. That coupled with years of innovative multi valve cylinder head design ensures our camshaft designs are the most efficient in providing maximum usable power across the widest power band.
Our Price: $1235.00
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Crawford Air / Oil Seperator - STi 08+ w/Top Mount IC
Drawing on our 35 years of racing knowledge, the Crawford Performance Closed Loop Air/Oil Separator was engineered and designed to keep the motor oil where it belongs – inside the motor and out of the intake system.
Our Price: $362.95
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DeatschWerks 1000cc WRX/07+ STi Fuel Injectors
These are the same injectors demanded by many of the most discriminating Subaru tuners including Cobb.
Prices are for a flow balanced set of 4 injectors
Each set is individually tested and flow ...
Our Price: $549.00
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DeatschWerks 650cc Fuel Injectors - STi 07+
These are the same injectors demanded by many of the most discriminating Subaru tuners including Cobb.
Prices are for a flow balanced set of 4 injectors
Each set is individually tested and flow ...
Our Price: $369.00
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DeatschWerks 750cc 07 STi Fuel Injectors
These are the same injectors demanded by many of the most discriminating Subaru tuners including Cobb.
Prices are for a flow balanced set of 4 injectors
Each set is individually tested and flow ...
Our Price: $439.00
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DeatschWerks 850cc 07 STi Fuel Injectors
These are the same injectors demanded by many of the most discriminating Subaru tuners including Cobb.
Prices are for a flow balanced set of 4 injectors
Each set is individually tested and flo...
Our Price: $549.00
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Dress Up Bolts Titanium Engine Bay Kit - Subaru WRX/STi 2008-2010
Take pride in your engine bay or engine? It’s time to take it to the next level with a Titanium Series Dress Up Kit for your engine bay and engine! These kits are a complete replacement for most visible bolts and nuts on your specific vehicle’s engine bay, ready to bolt in as soon as they arrive....
Our Price: $199.95
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Harman Motive Subaru Oil Cooler
With a 16 row oil cooler (over 1 ft long) with ultra-high quality lines and fittings, the Harman oil cooler is the perfect upgrade for the aggressive street car or track day warrior.
Our Price: $559.95
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HKS Hybrid Panel Air Intake Filter: WRX STi 08-09
If you are running a stock air filter do your car a favor and buy this hybrid drop in panel filter.
The hybrid is totally redesigned from the old school HKS drop in panel filter.
The HKS hybrid panel air filter has a redesigne...
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HKS Twin Power DLI II: SUBARU Impreza WRX STi 2008
The Twin Power ignition amplifier incorporates both the CDI and transistor method ignition to provide optimum spark duration and maximum voltage output, resulting in crisper throttle response and a smoother engine powerband.
The CDI method, capacity discharge ignition, pro...
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Hypertech Sport Power Programmer EMS - STi 08-09
Max Energy Sport Power Programmer Delivers The Maximum Tune!
The Hypertech Max Energy Power Tuning extracts every bit of energy
possible out of every molecule of fuel giving you more miles at
part-throttle and more power at wide-open throttle.
In order to ...
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K&N 57i Performance Induction Kit: SUBARU IMPREZA WRX/STI 2.5I TURBO 07-09
The Subaru Impreza WRX STI is the highest standard edition in the Subaru compact car line. It is made in Japan and popular in Europe, Malaysia, Australia and Singapore. It was developed as a high performance turbo charged consumer version of the Subarus used in the FIA World Rally Championship Se...
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Mishimoto Hard Upper Radiator Pipe - STi 08+
The Mishimoto Aluminum STi Radiator Hose offers a strong,
stylish replacement for your WEAK factory rubber radiator hose.
The Mishimoto STi aluminum
upper radiator hoses are CNC mandrel bent and made of high-quality T6
temper aluminum.
Add some color under t...
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Mishimoto Performance X Line Radiator - STi 08-10
The Mishimoto X-Line performance aluminum radiator for the Subaru STI is designed with a larger 3 row core to maximize cooling efficiency, boost engine functions, and protect your car from overheating.
It is the ideal upgrade to the stock Subaru radiator. Whether you drive you...
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Mishimoto STI Performance Aluminum Radiator - STi 08-09
The Mishimoto performance aluminum radiator for the Subaru WRX and STI is designed and engineered to maximize cooling efficiency by up to 30%, boost engine functions, and most importantly protect your car from overheating.
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Perrin Coolant Overflow Tank
FEED YOUR COOLANT SYSTEM IN STYLE!
Replace
your ugly OEM plastic coolant overflow tank with a sleek one from
PERRIN! The kit includes a powdercoated coolant tank as well as various
mounting brackets that all...
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Perrin Lightened Crank Pulley - STi 2004+
NEWLY REDESIGNED TO MAKE INSTALLATION ON 2008+ WRX/STI MUCH EASIER!
Yes we took our classic WRX pulley and modified the rear belt keeper to
make for easier installation on the new 08+ WRX and STI. For those who
have not seen these, there is no AC belt tensioner an...
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Perrin Oil Catch Can/Overflow Tank
OIL CATCH CAN
Blow-by is a constant problem with any turbocharged engine. While a
normal byproduct of the combustion process if it isn’t contained
outside the engine it will collect and gum up the valve train, turbo
and most importantly the intercooler and plumbing. When this occu...
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Perrin Panel Air Filter: Subaru STi 08+
Don’t let a flimsy paper filter get between you and true performance.
The PERRIN Performance™ dual stage, “Open Cell” foam, drop-in Panel
Filter is the answer. Increases in horsepower are a simple easy install
away! Quick cleans are simple with our aerosol cleaner and spray oil.
Our Price: $49.95
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Snow Stage 2 Boost Cooler: WRX STi
More power over a wider range and better drivability is the result. 20% increases in Horsepower typical.
The Digital Variable Control unit proportionally injects more or less water-methanol according to input signals from the mass air...
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stiperformanceparts.com is not affiliated, related to, or endorsed by Subaru of America or Fuji Heavy Industries LTD in any way. stiperformanceparts.com is an independent retailer of performance parts and accessories that is not affiliated with Subaru of America (Fuji Heavy Industries LTD). Use of trademarks is done on a fair use basis and without intent to compete with, or take advantage of Subaru or its trademarks. For more information on Subaru please visit http://www.subaru.com
