Skip to content

TUNING
SERVICE
APPAREL
AUDI
BMW
- M2
  - G87
- M3
  - G Series
  - F Series
- M4
  - G Series
  - F Series
- M240i
  - G42
  - F22
- M340i
  - G20
- M440i
  - G22
LAMBORGHINI
- Huracan (all)
- Urus
MITSUBISHI
- LANCER EVO
NISSAN
- R35 GT-R
- R32 GT-R
- R33 GT-R
- R34 GT-R
SUBARU
- WRX
  - 2022+
  - 2015-2021
  - 2011-2014
  - 2008-2010
  - 2006-2007
  - 2004-2005
  - 2002-2003
- STI
  - 2018-2021
  - 2015-2017
  - 2011-2014
  - 2008-2010
  - 2007
  - 2006
  - 2005
  - 2004
- BRZ
  - 2022+
  - 2012-2020
- FORESTER XT
- LEGACY GT
- OUTBACK XT
  - 2008-2009
  - 2005-2007
TOYOTA
- GR COROLLA
  - 2023+
- GR SUPRA
  - 2020+
- GR86
  - 2022+
- 86
  - 2012-2020
WHEELS/TIRES
- Wheels
  - By Brand
    - Volk
    - Work
    - Gram Lights
    - Enkei
    - Kansei
  - 5x114.3
  - 5x100
- Tires
- Lug Nuts
  - M12x1.25
  - M12x1.5
- Wheel Accessories
LIGHTING
UNIVERSAL

Country/region

Country/region

Facebook
Instagram
TikTok
YouTube

TUNING
SERVICE
APPAREL
AUDI
BMW
- M2
  - G87
- M3
  - G Series
  - F Series
- M4
  - G Series
  - F Series
- M240i
  - G42
  - F22
- M340i
  - G20
- M440i
  - G22
LAMBORGHINI
- Huracan (all)
- Urus
MITSUBISHI
- LANCER EVO
NISSAN
- R35 GT-R
- R32 GT-R
- R33 GT-R
- R34 GT-R
SUBARU
- WRX
  - 2022+
  - 2015-2021
  - 2011-2014
  - 2008-2010
  - 2006-2007
  - 2004-2005
  - 2002-2003
- STI
  - 2018-2021
  - 2015-2017
  - 2011-2014
  - 2008-2010
  - 2007
  - 2006
  - 2005
  - 2004
- BRZ
  - 2022+
  - 2012-2020
- FORESTER XT
- LEGACY GT
- OUTBACK XT
  - 2008-2009
  - 2005-2007
TOYOTA
- GR COROLLA
  - 2023+
- GR SUPRA
  - 2020+
- GR86
  - 2022+
- 86
  - 2012-2020
WHEELS/TIRES
- Wheels
  - By Brand
    - Volk
    - Work
    - Gram Lights
    - Enkei
    - Kansei
  - 5x114.3
  - 5x100
- Tires
- Lug Nuts
  - M12x1.25
  - M12x1.5
- Wheel Accessories
LIGHTING
UNIVERSAL

Search

Item added to your cart

View cart

Collection: 2004 STI

Sort by:

588 products

Filter:

Product type (0)

Product type

Air Boxes (3 products)
Air Filters - Drop In (1 product)
Air Intake + Accessories (11 products)
Alignment Kits (1 product)
Alternator Mount Kit (2 products)
Ball Joints (1 product)
Battery Tiedowns (9 products)
Belts - Timing, Accessory (1 product)
Big Brake Kits (1 product)
Boost Controllers + Accessories (1 product)
BOV and BPV (30 products)
Brackets (2 products)
Brake Calipers + Rebuild (3 products)
Brake Hardware (2 products)
Brake Line Kits (2 products)
Brake Pads (43 products)
Brake Rotors (35 products)
Brake Shoes (1 product)
Bushing Kits (26 products)
Camber Kits (2 products)
Cat Back Exhaust (5 products)
Clutch Discs (9 products)
Clutch Kits - Multi (8 products)
Clutch Kits - Single (13 products)
Coilovers + Accessories (3 products)
Coolant Reservoirs (2 products)
Cylinder Head + Sets (9 products)
Cylinder Head Gaskets (2 products)
Cylinder Head Studs + Bolts (2 products)
Diff Mounts + Braces + Bushings (5 products)
Dipsticks (9 products)
Downpipes (2 products)
ECU Tunes (2 products)
Engine Coolant Reservoir (2 products)
Engine Covers (4 products)
Engine Gaskets + Sets (1 product)
Engine Long Block (5 products)
Engine Mounts (22 products)
Engine Oil Change Kit (4 products)
Engine Short Block (7 products)
Exhaust Adapters (4 products)
Exhaust Manifolds + Accessories (4 products)
Fittings (2 products)
Flanges (2 products)
Flywheels (8 products)
Fuel Filters (3 products)
Fuel Injectors + Accessories (5 products)
Fuel Lines (1 product)
Fuel Pressure Regulators + Accessories (1 product)
Fuel Pumps + Hangers (9 products)
Fuel Rails (1 product)
Hardware (2 products)
Heat Shields (2 products)
Hoses (7 products)
Intercoolers + Accessories (14 products)
LED (3 products)
Lowering Springs (3 products)
Manual Transmission Mount (9 products)
Mud Flaps (8 products)
Muffler (2 products)
Multi-Purpose Light Bulb (2 products)
Oil Caps (9 products)
Oil Catch Can (1 product)
Oil Coolers (5 products)
Oil Filters (2 products)
Oil Pan + Baffles + Gaskets (6 products)
Oil Separators (5 products)
Oil Strainers + Gaskets (1 product)
Power Packages (2 products)
Power Steering Line (2 products)
Pressure Plates (2 products)
Programmers + Accessories (1 product)
Pulleys - Crank, Underdrive (6 products)
Radiator Caps (6 products)
Radiator Hoses (2 products)
Radiator Stays (7 products)
Radiators (3 products)
Shift Knobs (6 products)
Shifter Bushings (8 products)
Shifters (5 products)
Shock Mounts & Camber Plates (2 products)
Silicone Couplers & Hoses (4 products)
Spark Plugs (4 products)
Strut Bars (8 products)
Super Core Assemblies (4 products)
Suspension Arms & Components (2 products)
Sway Bar Bushings (4 products)
Sway Bar Endlinks (6 products)
Sway Bars (12 products)
Timing Belts + Components (6 products)
Tow Hooks (4 products)
Transmission Mounts (5 products)
Turbine Housings (6 products)
Turbo Inlets (2 products)
Turbo Kits (3 products)
Turbo Oil Lines + Accessories (1 product)
Turbochargers (7 products)
Wastegate + Accessories (9 products)
Wheel Spacers & Adapters (7 products)
Windage Tray (1 product)

Air Boxes (3 products)
Air Filters - Drop In (1 product)
Air Intake + Accessories (11 products)
Alignment Kits (1 product)
Alternator Mount Kit (2 products)
Ball Joints (1 product)
Battery Tiedowns (9 products)
Belts - Timing, Accessory (1 product)
Big Brake Kits (1 product)
Boost Controllers + Accessories (1 product)
BOV and BPV (30 products)
Brackets (2 products)
Brake Calipers + Rebuild (3 products)
Brake Hardware (2 products)
Brake Line Kits (2 products)
Brake Pads (43 products)
Brake Rotors (35 products)
Brake Shoes (1 product)
Bushing Kits (26 products)
Camber Kits (2 products)
Cat Back Exhaust (5 products)
Clutch Discs (9 products)
Clutch Kits - Multi (8 products)
Clutch Kits - Single (13 products)
Coilovers + Accessories (3 products)
Coolant Reservoirs (2 products)
Cylinder Head + Sets (9 products)
Cylinder Head Gaskets (2 products)
Cylinder Head Studs + Bolts (2 products)
Diff Mounts + Braces + Bushings (5 products)
Dipsticks (9 products)
Downpipes (2 products)
ECU Tunes (2 products)
Engine Coolant Reservoir (2 products)
Engine Covers (4 products)
Engine Gaskets + Sets (1 product)
Engine Long Block (5 products)
Engine Mounts (22 products)
Engine Oil Change Kit (4 products)
Engine Short Block (7 products)
Exhaust Adapters (4 products)
Exhaust Manifolds + Accessories (4 products)
Fittings (2 products)
Flanges (2 products)
Flywheels (8 products)
Fuel Filters (3 products)
Fuel Injectors + Accessories (5 products)
Fuel Lines (1 product)
Fuel Pressure Regulators + Accessories (1 product)
Fuel Pumps + Hangers (9 products)
Fuel Rails (1 product)
Hardware (2 products)
Heat Shields (2 products)
Hoses (7 products)
Intercoolers + Accessories (14 products)
LED (3 products)
Lowering Springs (3 products)
Manual Transmission Mount (9 products)
Mud Flaps (8 products)
Muffler (2 products)
Multi-Purpose Light Bulb (2 products)
Oil Caps (9 products)
Oil Catch Can (1 product)
Oil Coolers (5 products)
Oil Filters (2 products)
Oil Pan + Baffles + Gaskets (6 products)
Oil Separators (5 products)
Oil Strainers + Gaskets (1 product)
Power Packages (2 products)
Power Steering Line (2 products)
Pressure Plates (2 products)
Programmers + Accessories (1 product)
Pulleys - Crank, Underdrive (6 products)
Radiator Caps (6 products)
Radiator Hoses (2 products)
Radiator Stays (7 products)
Radiators (3 products)
Shift Knobs (6 products)
Shifter Bushings (8 products)
Shifters (5 products)
Shock Mounts & Camber Plates (2 products)
Silicone Couplers & Hoses (4 products)
Spark Plugs (4 products)
Strut Bars (8 products)
Super Core Assemblies (4 products)
Suspension Arms & Components (2 products)
Sway Bar Bushings (4 products)
Sway Bar Endlinks (6 products)
Sway Bars (12 products)
Timing Belts + Components (6 products)
Tow Hooks (4 products)
Transmission Mounts (5 products)
Turbine Housings (6 products)
Turbo Inlets (2 products)
Turbo Kits (3 products)
Turbo Oil Lines + Accessories (1 product)
Turbochargers (7 products)
Wastegate + Accessories (9 products)
Wheel Spacers & Adapters (7 products)
Windage Tray (1 product)

Brand (0)

Brand

Color (0)

Color

Blue (1 product)
Cool White (1 product)
Red (1 product)

Blue (1 product)
Cool White (1 product)
Red (1 product)

Price

The highest price is $18,199.99

$

From

To

Availability (0)

Availability

In stock (587 products)
Out of stock (1 product)

In stock (587 products)
Out of stock (1 product)

Sort by:

Filter and sort Filter

Filter and sort

Filter

588 products

Product type

Air Boxes (3 products)
Air Filters - Drop In (1 products)
Air Intake + Accessories (11 products)
Alignment Kits (1 products)
Alternator Mount Kit (2 products)
Ball Joints (1 products)
Battery Tiedowns (9 products)
Belts - Timing, Accessory (1 products)
Big Brake Kits (1 products)
Boost Controllers + Accessories (1 products)
BOV and BPV (30 products)
Brackets (2 products)
Brake Calipers + Rebuild (3 products)
Brake Hardware (2 products)
Brake Line Kits (2 products)
Brake Pads (43 products)
Brake Rotors (35 products)
Brake Shoes (1 products)
Bushing Kits (26 products)
Camber Kits (2 products)
Cat Back Exhaust (5 products)
Clutch Discs (9 products)
Clutch Kits - Multi (8 products)
Clutch Kits - Single (13 products)
Coilovers + Accessories (3 products)
Coolant Reservoirs (2 products)
Cylinder Head + Sets (9 products)
Cylinder Head Gaskets (2 products)
Cylinder Head Studs + Bolts (2 products)
Diff Mounts + Braces + Bushings (5 products)
Dipsticks (9 products)
Downpipes (2 products)
ECU Tunes (2 products)
Engine Coolant Reservoir (2 products)
Engine Covers (4 products)
Engine Gaskets + Sets (1 products)
Engine Long Block (5 products)
Engine Mounts (22 products)
Engine Oil Change Kit (4 products)
Engine Short Block (7 products)
Exhaust Adapters (4 products)
Exhaust Manifolds + Accessories (4 products)
Fittings (2 products)
Flanges (2 products)
Flywheels (8 products)
Fuel Filters (3 products)
Fuel Injectors + Accessories (5 products)
Fuel Lines (1 products)
Fuel Pressure Regulators + Accessories (1 products)
Fuel Pumps + Hangers (9 products)
Fuel Rails (1 products)
Hardware (2 products)
Heat Shields (2 products)
Hoses (7 products)
Intercoolers + Accessories (14 products)
LED (3 products)
Lowering Springs (3 products)
Manual Transmission Mount (9 products)
Mud Flaps (8 products)
Muffler (2 products)
Multi-Purpose Light Bulb (2 products)
Oil Caps (9 products)
Oil Catch Can (1 products)
Oil Coolers (5 products)
Oil Filters (2 products)
Oil Pan + Baffles + Gaskets (6 products)
Oil Separators (5 products)
Oil Strainers + Gaskets (1 products)
Power Packages (2 products)
Power Steering Line (2 products)
Pressure Plates (2 products)
Programmers + Accessories (1 products)
Pulleys - Crank, Underdrive (6 products)
Radiator Caps (6 products)
Radiator Hoses (2 products)
Radiator Stays (7 products)
Radiators (3 products)
Shift Knobs (6 products)
Shifter Bushings (8 products)
Shifters (5 products)
Shock Mounts & Camber Plates (2 products)
Silicone Couplers & Hoses (4 products)
Spark Plugs (4 products)
Strut Bars (8 products)
Super Core Assemblies (4 products)
Suspension Arms & Components (2 products)
Sway Bar Bushings (4 products)
Sway Bar Endlinks (6 products)
Sway Bars (12 products)
Timing Belts + Components (6 products)
Tow Hooks (4 products)
Transmission Mounts (5 products)
Turbine Housings (6 products)
Turbo Inlets (2 products)
Turbo Kits (3 products)
Turbo Oil Lines + Accessories (1 products)
Turbochargers (7 products)
Wastegate + Accessories (9 products)
Wheel Spacers & Adapters (7 products)
Windage Tray (1 products)

Clear

Brand

Clear

Color

Blue (1 products)
Cool White (1 products)
Red (1 products)

Clear

Price

The highest price is $18,199.99

$

From

$

To

Clear

Availability

In stock (587 products)
Out of stock (1 products)

Clear

Sort by:

Remove all

588 products

02-07 Subaru WRX/STI Interior Bulb Kit

02-07 Subaru WRX/STI Interior Bulb Kit

Regular price From $35.25 USD

Regular price Sale price From $35.25 USD
Unit price per
Engine Oil Pan Drain Plug Gasket - EJ20/EJ25

Engine Oil Pan Drain Plug Gasket - EJ20/EJ25

Regular price $1.98 USD

Regular price Sale price $1.98 USD
Unit price per
Subaru Engine Oil Filter EJ20/EJ25

Subaru Engine Oil Filter EJ20/EJ25

Regular price $9.05 USD

Regular price Sale price $9.05 USD
Unit price per
Motul 5w40 X-CESS Gen 2 Oil Change Kit Subaru EJ WRX/STI

Sale

Motul 5w40 X-CESS Gen 2 Oil Change Kit Subaru EJ WRX/STI

Regular price $74.00 USD

Regular price ~~$82.00 USD~~ Sale price $74.00 USD
Unit price per

Sale
K-NASTY Stage 2 OTS Maps Subaru 2002-2007 WRX / 2004-2007 STI

K-NASTY Stage 2 OTS Maps Subaru 2002-2007 WRX / 2004-2007 STI

Regular price $250.00 USD

Regular price Sale price $250.00 USD
Unit price per
IAG 750 EJ25 Subaru Closed Deck Short Block For WRX STI LGT FXT - 750BHP

IAG 750 EJ25 Subaru Closed Deck Short Block For WRX STI LGT FXT - 750BHP

Regular price $5,299.99 USD

Regular price ~~$4,999.99 USD~~ Sale price $5,299.99 USD
Unit price per
Torque Solution Engine/Trans/Silver Pitch Mount Kit w/Mount Plates 02-14 Subaru WRX/2004+ Subaru STI

Torque Solution Engine/Trans/Silver Pitch Mount Kit w/Mount Plates 02-14 Subaru WRX/2004+ Subaru STI

Regular price $755.54 USD

Regular price Sale price $755.54 USD
Unit price per
Torque Solution Engine / Transmission / Silver Pitch Mount - 02-14 Subaru WRX / 2004+ Subaru STI

Torque Solution Engine / Transmission / Silver Pitch Mount - 02-14 Subaru WRX / 2004+ Subaru STI

Regular price $661.10 USD

Regular price Sale price $661.10 USD
Unit price per
Torque Solution Engine/Trans Red Pitch Mount Kit w/ Mount Plates 02-14 Subaru WRX / 2004+ Subaru STi

Torque Solution Engine/Trans Red Pitch Mount Kit w/ Mount Plates 02-14 Subaru WRX / 2004+ Subaru STi

Regular price $755.54 USD

Regular price Sale price $755.54 USD
Unit price per
Torque Solution Engine / Transmission / Red Pitch Mount 02-14 Subaru WRX / 2004+ Subaru STI

Torque Solution Engine / Transmission / Red Pitch Mount 02-14 Subaru WRX / 2004+ Subaru STI

Regular price $661.10 USD

Regular price Sale price $661.10 USD
Unit price per
Torque Solution Engine/Trans/Purple Pitch Mount Kit w/Mount Plates - 02-14 Subaru WRX/04+ Subaru STI

Torque Solution Engine/Trans/Purple Pitch Mount Kit w/Mount Plates - 02-14 Subaru WRX/04+ Subaru STI

Regular price $755.54 USD

Regular price Sale price $755.54 USD
Unit price per
Torque Solution Engine /Transmission/Purple Pitch Mount - 02-14 Subaru WRX / 2004+ Subaru STI

Torque Solution Engine /Transmission/Purple Pitch Mount - 02-14 Subaru WRX / 2004+ Subaru STI

Regular price $661.10 USD

Regular price Sale price $661.10 USD
Unit price per
Torque Solution Engine/Trans/Blue Pitch Mount Kit w/ Mount Plates: 02-14 Subaru WRX / 04+ Subaru STi

Torque Solution Engine/Trans/Blue Pitch Mount Kit w/ Mount Plates: 02-14 Subaru WRX / 04+ Subaru STi

Regular price $755.54 USD

Regular price Sale price $755.54 USD
Unit price per
Torque Solution Engine / Transmission / Blue Pitch Mount: 2002-2014 Subaru WRX / 2004+ Subaru STi

Torque Solution Engine / Transmission / Blue Pitch Mount: 2002-2014 Subaru WRX / 2004+ Subaru STi

Regular price $661.10 USD

Regular price Sale price $661.10 USD
Unit price per
IAG 950 EJ25 Destroked 2.35L Closed Deck Short Block For WRX, STI, LGT, FXT - 950BHP

IAG 950 EJ25 Destroked 2.35L Closed Deck Short Block For WRX, STI, LGT, FXT - 950BHP

Regular price $6,799.99 USD

Regular price Sale price $6,799.99 USD
Unit price per
IAG 1150 Destroked 2.35L Subaru Closed Deck Short Block For WRX, STI, LGT, FXT - 1150 BHP

IAG 1150 Destroked 2.35L Subaru Closed Deck Short Block For WRX, STI, LGT, FXT - 1150 BHP

Regular price $10,199.99 USD

Regular price ~~$8,999.99 USD~~ Sale price $10,199.99 USD
Unit price per
Forced Performance FP XR Ball Bearing Blue 73HTZ Turbocharger - Subaru EJ Motors

Forced Performance FP XR Ball Bearing Blue 73HTZ Turbocharger - Subaru EJ Motors

Regular price From $2,699.00 USD

Regular price Sale price From $2,699.00 USD
Unit price per
Forced Performance FP XR RED 79HTZ Turbocharger - Subaru EJ Motors

Forced Performance FP XR RED 79HTZ Turbocharger - Subaru EJ Motors

Regular price From $2,899.00 USD

Regular price Sale price From $2,899.00 USD
Unit price per
Forced Performance FP XR BLACK 82HTZ Turbocharger - Subaru EJ Motors

Forced Performance FP XR BLACK 82HTZ Turbocharger - Subaru EJ Motors

Regular price From $2,899.00 USD

Regular price Sale price From $2,899.00 USD
Unit price per
Forced Performance UHF™ FP BLUE 51S - Subaru EJ Motors

Forced Performance UHF™ FP BLUE 51S - Subaru EJ Motors

Regular price $1,499.00 USD

Regular price Sale price $1,499.00 USD
Unit price per
Forced Performance FP Red - Subaru EJ Motors

Forced Performance FP Red - Subaru EJ Motors

Regular price From $1,499.00 USD

Regular price Sale price From $1,499.00 USD
Unit price per
Forced Performance FP Black - Subaru EJ Motors

Forced Performance FP Black - Subaru EJ Motors

Regular price From $1,629.00 USD

Regular price Sale price From $1,629.00 USD
Unit price per
Forced Performance FP Green UHF™ - Subaru EJ Motors

Forced Performance FP Green UHF™ - Subaru EJ Motors

Regular price From $1,449.00 USD

Regular price Sale price From $1,449.00 USD
Unit price per
K-NASTY 2002-2007 Subaru WRX/STI Dyno Tune

K-NASTY 2002-2007 Subaru WRX/STI Dyno Tune

Regular price $700.00 USD

Regular price Sale price $700.00 USD
Unit price per

1
2
3
…
25

Contact Us

sales@circuitdemon.com

585-420-6920

640 East Main Street

Palmyra, NY 14522

Open Monday through Friday 9am-5pm

Menu

The New Circuit Demon
Shop
Blog
Contact Us
FAQ's

Share your email to be the first to know about exclusive offers, behind the scenes footage, and new product alerts.

Email

Facebook
Instagram
YouTube
TikTok

Country/region

Country/region

© 2025, Circuit Demon Powered by Shopify

Refund policy
Privacy policy
Terms of service
Shipping policy
Contact information

Choosing a selection results in a full page refresh.
Opens in a new window.