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Lock Down a Lightweight Battery in Your WRX or STI
The GrimmSpeed Lightweight Battery Mount Kit gives 2008 to 2014 Subaru WRX and STI owners a secure, purpose built way to run a lightweight battery. Swapping to a lightweight battery is one of the easiest ways to remove weight from the front of your Subaru, and GRM121028 shaves roughly 55 percent off the weight of the factory 34 pound battery when paired with an Odyssey PC680 or similarly sized battery. The laser cut, CNC bent aluminum bracket features three mounting points that securely hold both the tray and the battery, and the entire kit installs with no cutting or drilling required. Finished in a durable black texture powdercoat, GRM121028 is built to handle the rigors of autocross and track use while keeping your engine bay clean and organized.
Key Features
- Laser cut, CNC bent aluminum bracket for a precise fit
- Durable black texture powdercoat finish
- Three mounting points securely hold the tray and battery
- Compatible with the Odyssey PC680 battery or similarly sized batteries
- Removes about 55 percent of the weight of the factory battery
- No cutting or drilling required for installation
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 2008-2014 | Subaru | WRX STI |
Specifications
| Detail | Value |
|---|---|
| Brand | GrimmSpeed |
| MPN | GRM121028 |
| Material | Aluminum |
| Finish | Black Texture Powdercoat |
| Battery Compatibility | Odyssey PC680 or similar size |
| UPC | Not published by manufacturer |
What's Included
- 1 GrimmSpeed lightweight battery mount tray
- Mounting hardware
Battery is not included.
About GrimmSpeed
GrimmSpeed is a Seattle based performance manufacturer that designs and builds parts specifically for the Subaru and import performance community. Every part is engineered, tested, and produced with a focus on real world durability, easy installation, and measurable performance gains, making GrimmSpeed a trusted name among WRX and STI owners nationwide.
FAQ
What is the GRM121028?The GRM121028 is a GrimmSpeed Lightweight Battery Mount Kit built for the 2008 to 2014 Subaru WRX STI.
Does GRM121028 include a battery?No, GRM121028 is the mount kit only. A lightweight battery such as the Odyssey PC680 is sold separately.
How much weight does GRM121028 save?Switching to a lightweight battery with GRM121028 removes about 55 percent of the weight of the factory 34 pound battery.
Is GRM121028 easy to install?Yes, GRM121028 installs with no cutting or drilling and typically takes 60 to 90 minutes for a first time install.
What material is GRM121028 made from?GRM121028 uses a laser cut, CNC bent aluminum bracket finished in black texture powdercoat.
Does GRM121028 fit the standard WRX as well as the STI?Yes, GRM121028 fits the 2008 to 2014 Subaru WRX and WRX STI, which share the same battery tray mounting points.
Does GRM121028 pass SCCA AutoX tech inspection?GrimmSpeed designed GRM121028 with SCCA AutoX class rules in mind, though final tech approval depends on your specific class and inspector.
How many mounting points does GRM121028 use?GRM121028 uses a three point mounting design to securely hold the tray and battery in place.
Install Instructions
- Remove the plastic cover on the positive battery terminal and loosen the connection.
- Remove the positive and negative terminals and tuck them behind the battery.
- Loosen and remove the nuts on the OEM battery tie down using a 10mm deep well socket.
- Lift the battery and OEM tray out of the engine bay.
- Insert the M6x1 allen head bolts into the GRM121028 tray mounting holes and thread on the t-nuts.
- Thread the locking nuts onto the bolts and tighten so they will not spin, then back the t-nuts off toward the tray.
- Place the tray into position so both t-nuts drop into their mounting holes, then secure with the 10mm bolt at the side mounting point.
- Install the battery, attach the included terminals, secure the tiedown, and reconnect the negative terminal first, then the positive terminal.
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