GrimmSpeed Alternator Cover Black 02-14 WRX / 04-21 STI / 05-09 Legacy GT / 04-13 Forester XT

Upgrade your engine bay with the GrimmSpeed Alternator Cover—designed to replace the stock plastic cover with a durable, stylish, and perfectly engineered solution. Its asymmetric design complements the GrimmSpeed Tool Tray Radiator Shroud, giving your engine bay a cohesive, high-performance look. 

Quick Specs

• Laser-Cut Venting: Provides optimal cooling for your alternator
• Machined Aluminum Mounts: Black anodized for corrosion resistance and a sleek finish
• Durable Powdercoat: Heavy-duty DuPont textured finish resists discoloration
• Slotted Mounting Features: Allows for flexible fitment with tweaked factory brackets
• Drive-By-Cable Dimples: Hidden punch marks for proper cable routing

Design

• Using a FARO Arm and 3D CAD software, GrimmSpeed meticulously mapped mounting points and critical components across multiple model years to ensure perfect clearance and fit. Unlike generic covers, this design avoids contact with hoses, wiring, accessory belts, or pulleys, eliminating the risk of damage while providing a clean, professional appearance.

Fitment:

• 2002-2014 Subaru WRX
• 2004-2021 Subaru STI
• 2005-2009 Subaru Legacy GT (*OEM Impreza bracket required)
• 2005-2009 Subaru Outback XT (*OEM Impreza bracket required)
• 2004-2013 Subaru Forester XT (*OEM Impreza bracket required)
• 2005-2006 Saab 9-2x Aero

OEM Impreza bracket part number 23791AA002 (Stay - CVR P/S Belt) is required for proper installation. Please be sure to add this item as an option to your order if you prefer not to source the bracket yourself.

Installation Instructions