GrimmSpeed

Overview

GrimmSpeed manufactures engineered performance parts primarily for Subaru vehicles, including models like WRX, STI, and BRZ. The company focuses on aftermarket solutions for enthusiasts, emphasizing quality and integration for enhanced engine performance.¹⁴⁵

History

GrimmSpeed was founded in 2006 by Justin Grimm in a single-stall garage in Maplewood, MN, initially focusing on porting and polishing Subaru manifolds.¹² It expanded to platforms including Mitsubishi, Ford, Mazda, VW, Hyundai, Toyota, Lexus, BMW Mini, and Scion before narrowing back to Subaru parts.¹² In 2019, it partnered with an organization of aftermarket performance companies for expanded resources and facilities; by end of 2020, the controlling firm resold the company and founder Justin Grimm was let go.¹²

Product Lines

Manufacturing

Products are manufactured in the United States with in-house engineering and design.² Following the 2019 partnership, manufacturing capabilities expanded with new facilities including a warehouse and engineering space.¹

Notable Products

• Axleback Exhaust - Bolt-on exhaust for WRX/STI improving flow and sound.
• Cobb Accessport - No, GrimmSpeed's own tuners; wait, correction based on focus: GrimmSpeed Tension Rods
• Tension Rods & Bushings - Front suspension upgrade reducing flex for better handling.
• Radium Engineering Catch Can Kit (partnered) - No, GrimmSpeed: Silicone Intake Tract
• Silicone Intake Tract - High-flow intake piping replacing restrictive factory parts.
• Top-Mount Intercooler - Direct-fit intercooler for STI reducing heat soak.

Reputation

GrimmSpeed is regarded by Subaru enthusiasts for high-quality, U.S.-made performance parts with strong focus on engineering for WRX and STI models.¹²⁴ Strengths include competitive pricing, innovation, and customer service, though the 2020 ownership change and founder departure led to some community uncertainty.² Professionals note reliable fitment and real-world performance gains.⁵