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Shed Front End Weight Without Sacrificing Reliability
The factory battery on an 08 to 14 Subaru WRX or STI tips the scales at roughly 34 pounds sitting right over the front axle, adding weight exactly where you least want it for handling balance. The GRMGRM121034 GrimmSpeed Lightweight Battery Mount Kit is designed around the compact Odyssey PC680 style battery, cutting front end weight by about 55 percent compared to the factory setup. Built from laser cut, CNC bent aluminum, the GRMGRM121034 tray uses three secure mounting points and installs without any cutting or drilling. For autocross and track focused builds, the GRMGRM121034 is an easy way to trim real weight while keeping a fully functional charging system.
Key Features
- Laser cut, CNC bent aluminum bracket construction
- Removes up to 19 lbs from the front of the vehicle versus the OEM battery
- Knocks off approximately 55 percent of weight compared to the OEM battery
- Compatible with the Odyssey PC680 battery, including its metal case
- 3 secure mounting points, no cutting or drilling required
- Durable black or red texture powder coat finish
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2008-2014 | Subaru | WRX STI |
Specifications
| Detail | Value |
|---|---|
| Part Number | GRMGRM121034 |
| UPC | Not published by manufacturer |
| Material | CNC Bent Aluminum |
| Finish | Red Texture Powder Coat |
| Battery Compatibility | Odyssey PC680 or similar size battery |
| Battery Included | No, battery not included |
| Brand | GrimmSpeed |
What's Included
- 1 lightweight aluminum battery tray
- Battery tie down bracket
- Mounting bolts, washers, and nuts
About GrimmSpeed
GrimmSpeed started as a small garage operation in Minneapolis, Minnesota in 2006 and has grown into one of the most trusted names in Subaru performance. What began with a focus on WRX and STI parts has expanded to Mitsubishi, Ford, MazdaSpeed, and Hyundai platforms, but the engineering philosophy has stayed the same: build parts that are tougher, smarter, and better finished than anything else on the market.
FAQ
What is the GRMGRM121034?The GRMGRM121034 is a GrimmSpeed Lightweight Battery Mount Kit built for the 2008-2014 Subaru WRX STI. It replaces the factory battery tray with a lightweight aluminum design built around a compact Odyssey PC680 style battery.
Does the GRMGRM121034 include a battery?No. The GRMGRM121034 kit includes the tray and mounting hardware only. The battery is sold separately.
How much weight does the GRMGRM121034 save?The GRMGRM121034 shaves approximately 19 lbs from the front of the vehicle, cutting about 55 percent of the weight compared to the factory battery setup.
What battery works with the GRMGRM121034?The GRMGRM121034 is designed around the Odyssey PC680 battery or a similarly sized unit, including compatibility with its metal case.
Does the GRMGRM121034 require cutting or drilling?No. The GRMGRM121034 installs using 3 mounting points with no cutting or drilling required.
Is the GRMGRM121034 legal for SCCA Autocross?Many autocross competitors run the GRMGRM121034 setup without issue, though rules vary by class and region, so it is worth confirming with your local tech inspector.
What finish options are available for the GRMGRM121034?The GRMGRM121034 is finished in a durable texture powder coat, available in red or black depending on the listing.
How long does installation of the GRMGRM121034 take?Most installers complete the GRMGRM121034 swap in under an hour with basic hand tools.
Install Instructions
- Disconnect the negative terminal first, then the positive terminal, and remove the factory battery.
- Remove the factory battery tray from the engine bay.
- Install the GRMGRM121034 aluminum tray using the provided mounting hardware and the 3 factory mounting points.
- Set the Odyssey PC680 or similar battery onto the new tray with terminals facing up.
- Place the included tie down bracket over the battery and thread the bolts through the mounting holes.
- Tighten the tie down evenly on both sides until the battery is secure.
- Reconnect the positive terminal first, then the negative terminal, and confirm the battery is fully secured before closing the hood.
Prop 65 Warning
Operating, servicing, and maintaining a passenger vehicle or off road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service the vehicle in a well ventilated area, and wear gloves or wash hands frequently when servicing the vehicle. For more information visit www.P65Warnings.ca.gov/passenger-vehicle
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