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Database: Weighing WRX Parts

Before you can +lightness, you need to know what your parts weigh in the first place. So, this page will be a rolling list of parts that I have weighed either on my bathroom scale or on my hanging scale; some will be from forums or the manufacturer as well. At some point I would like to get a scale that can handle items that don’t register on the hanging scale. 

All OEM parts are from a 2003 WRX unless otherwise noted. 

Source Definitions:

  • bScale – Bathroom Scale
  • hScale – Hanging Scale
  • manuf. – Manufacturer’s listed weight
  •  other – link to source.

Engine Weights

Part Weight (ea.) Source Notes
OEM Size Battery35 lbsbScaleAftermarket Replacement Battery
STi v8 TMIC10 lbsbScale
Grimmspeed TMIC20 lbsbScale
Fuel Injector Brackets3 lbsbScaleBolts included; EJ207 version 8
Turbo Heat Shield0.6 lbshScaleUpper shield; painted.
OEM Air Box3.7 lbshScaleIncludes After MAF hose, clamps and K/N panel filter. No MAF.
OEM Air Box Snorkel1.3 lbshScale
K/N Typhoon Intake5.2 lbshScaleNo MAF. Includes clamps and coupling. Gold reflective tape throughout.
OEM WRX Axle Back20 lbsbScale
USDM “Genome” STi Axle Back16.5 lbshScale
Blitz Nur-Spec Axle BackTBD
Hood Prop Rod1.1 lbshScale
OEM Crank Pulley5.7 lbshScaleEJ207 version 8
JDM OEM Exhaust Header19.8 lbshScaleEJ207 version 8; Twin Scroll ; With Heat Shields
JDM OEM Exhaust Up-pipe8.8 lbs hScale EJ207 version 8; Twin Scroll; With Heat Shields
OEM STi Exhaust Manifold/Up-pipe~26 lbsotherLink 1 | Link 2
Cruise Control Module2.8 lbshScaleIncludes brackets and cable.
OEM Radiator Fans8.5 lbshScale
OEM Radiator7.7 lbshScale
OEM Exhaust Cam Gear0.8 lbshScale
VF37 Turbo
(Twin Scroll)		18 lbshScaleTurbosmart Wastegate Actuator

Exterior/Body Weights

Part Weight (ea.) Source Notes
OEM WRX Wing5.9 lbshScaleOne stud is missing.
OEM Fog Lights3 lbsbScaleBrackets and bulbs included
HT Auto Fog Light Covers1 lbs
OEM Headlight3.5 lbshScaleAmber delete; painted housing; passenger side.
Modified Front Bumper Cover15.4 lbshScaleIntegrated eBay v2 lip, STi side splitters and Fog Light covers; weight reduction (19.3 lbs prior to w/r).
JDM v7 STi Grill2.2 lbshScaleRepaired
Hella Horns1.7 lbshScalePair; Includes short brackets
2002-2003 WRX Front Fender5.7 lbshScaleSide marker included

Suspension/Chassis Weights

Part Weight (ea.) Source Notes
U-Brace25 lbsbScale
OEM Front Bumper Beam~26 lbs
Oswald Performance Lightweight Bumper Beam (F)6 lbsManuf.Install.
OEM WRX 20mm Swaybar (F)8.1 lbshScaleIncludes bushings and end links
OEM WRX 20mm Swaybar (R)TBD
OEM 2005 STi 20mm Swaybar (F) TBD
OEM 2005 STi 20mm Swaybar (R)TBD
SSR GT2 Wheels (17×8.5)16 lbsbScale
OEM 294mm Rotor (F)12.5 lbshScalehigh mileage
Centric 294mm Rotor (F)16.7 lbshScale
KNS 4k 316mm Rotor (F)21.1 lbshScale
KNS 4k 326mm Rotor (F)20.4 lbshScale
ABS Module6.8 lbshScaleIncludes mounting bracket
2003 WRX Brake Proportioning Valve0.5 lbshScaleIncluded mounting bracket
GD WRX Front Knuckle & Hub14.5 lbshScaleSome material removed for Evo Brembo mod.
GR STi Front Knuckle & Hub19.3 lbshScale

Drivetrain Weights

Part Weight (ea.) Source Notes
2003 WRX 5MT Transmission121 lbsbScaleFluid drained.
2003 WRX OEM Flywheel22.9 lbshScaleHigh mileage
ACT StreetLight Flywheel13.2 lbshScale
OEM WRX 5MT Driveshaft22 lbs—
WRX Front Axles (Male/Female)13.x lbshScale
WRX Front Axle CV Joint (Outer)3.5 lbshScaleGutted
Transmission Cross Mounts12.1 lbshScale
DSS Carbon Fiber Driveshaft12 lbs—
Torque Solutions Transmission Mount3.9 lbshScaleStuds missing.
OEM Pitch Mount0.4 lbshScale
R180 (clutch LSD)59 lbsbScaleW/O gear oil

Interior Weights

PartWeight (ea.)SourceNotes
Dash19.6 lbshScaleClock removed (0.4 lbs); includes passenger airbag and air vent ducting.
Driver’s Side Dash Panel (lower)1.5 lbshScale
Shifter Surround Trim & Boot0.4 lbshScale
Center Console (lower portion)4.4 lbshScale
Center Vents (w/Emergency switch)0.4 lbshScale
Parking Brake Trim (w/ Cup holder)0.6 lbshScale
Knee Guard1.5 lbshScale
Glove Box5.5 lbshScale
Blower Motor Assembly5.2 lbshScale
Passenger Seat42.5 lbshScaleIncludes seat rails and seat belt buckle

Extended Reading For Various Weights

https://www.iwsti.com/threads/anorexicsti-05-sti-lightweight-w-full-interior-2660lbs-62-lbs-to-2598.65805/

https://www.oakos.com/wrx/weights.htm

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3 responses to “Database: Weighing WRX Parts”

  1. Shik Avatar
    Shik

    This is really helpful! My daily’02 is quite stripped, as I am a huge fan of the Super Taikyu series, as well as the Kanjo racer civics, but I never weighed anything I removed so far.

    My two sons both have 6 speeds in their Imprezas, but I plan on swapping in a JDM 5 speed in mine just to help keep the weight down, and I love the 4.44 set up. Never planning on more than a VF34, and I drive like an old lady most of the time, so no worries there.

    Like

    Reply
    1. A.A.Smith Avatar
      A.A.Smith

      Thanks! I wanted to keep the 5MT for the weight savings and the simplicity. I do think the 6MT is paired very well with the EJ207, and it makes it a better car. The gearing is nearly perfect, although, I wouldn’t mind a long-ratio setup. That said, I don’t think it is as fun as the 5MT setup. The front diff and the extra weight killed some of my steering response. And there is really no need to spin up to 7 or 8k anymore with the 6MT.

      Liked by 1 person

      Reply
      1. Shik Avatar
        Shik

        Yep, I read your thoughts when you switched to the 6 speed. Very honest and enlightening details. Much appreciated. The 6 speed is amazing for sure. And I’m no professional racer or anything, but with my car being stripped and still having the 5 speed, it’s amazing how much lighter the car feels compared to my oldest son’s 6 speed bugeye. As you said perfectly, it just feels a bit more fun.

        Looking forward to more of your updates!

        Liked by 1 person

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