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GrimmSpeed Subaru Alternator Cover – 02-14 WRX – 04-21 STI

GrimmSpeed Subaru Alternator Cover – 02-14 WRX – 04-21 STI


Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what you need.





This cover mounts securely in place of your plastic factory cover and its asymmetric design is intended to compliment the GrimmSpeed Tool Tray Radiator Shroud perfectly. Available in either red, black or neon green textured powder coat to match the rest of your GrimmSpeed engine bay parts!

Once again utilizing our in-house FARO Arm along with 3D CAD software, we were able to map the location of not only the mounting points, but also the smaller, critical components in different model years. A belt cover designed without these in mind can wear through hoses or wiring and worse yet, may contact your accessory belts or pulley, causing serious damage. What this means for you is that the best fitting Alternator Cover on the market is here at last. It’s what you can expect from GrimmSpeed, and it’s what you’ll get with this kit.

Our Alternator Cover is precision laser cut from locally-sourced material and the drive-by-cable dimples are punched before its CNC bent for a perfect fit. Aluminum covers receive a durable DuPont powdercoat in a textured red, black or neon green. Mounting of the cover is facilitated by machined aluminum supports. Following the machining process, these supports are black anodized for a clean look and corrosion resistance. This is particularly important in an environment like your engine bay. Stainless Steel hardware finishes the look and keeps everything planted firmly.

Quick Specs

  • Laser Cut Venting – provides plenty of cooling for your alternator
  • Machined Aluminum Mounts – anodized black for a sleek look and corrosion resistance
  • Heavy Duty DuPont Powdercoat – ensures a durable finish and resists discoloration
  • Slotted Mounting Features – flexability for tweaked factory brackets
  • Drive-by-Cable Dimples – hidden on the bottom face, dimples locate holes for cable mounts where needed


Additional Information

Weight 2.3 lbs
Dimensions 18.1 × 8.5 × 3.2 in

Red, Black, Neon Green


  • 2002-2014 WRX
  • 2004-2021 STI
  • 2005-2009 LGT/OBXT*
  • 2004-2013 FXT*

**OEM Impreza bracket part number 23791AA002 (Stay – CVR P/S Belt) is required for proper installation.


Installation Guide

Install Guide

Drive by Cable Drilling Template