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Performance engine mounts (also commonly referred to as motor mounts) secure the engine to the chassis while controlling movement and vibration under load. Upgraded mounts are a popular modification for Subaru WRX and Subaru STI owners looking to reduce drivetrain flex, improve throttle response, and create a more direct connection between the engine and drivetrain.
When and Why to Upgrade Engine Mounts
Upgrading engine mounts is one of the most effective ways to reduce drivetrain movement and improve power delivery in performance-oriented builds. Compared to factory rubber mounts, aftermarket performance engine mounts limit excessive engine movement during acceleration, braking, and cornering.
This added stability is especially beneficial for modified vehicles, higher torque applications, and aggressive driving, where maintaining proper alignment under load helps deliver more consistent and predictable performance.
Street vs Performance Engine Mounts
Street-oriented engine mounts offer improved stability over stock while keeping NVH levels manageable for daily driving. Performance-focused mounts prioritize rigidity and control, making them better suited for high-horsepower builds, track use, and aggressive driving styles where minimizing engine movement is critical.
Engine Mounts for Subaru WRX & STI
Engine mounts designed for the Subaru WRX and STI are built to handle increased power and aggressive driving compared to factory components. By reducing unwanted engine movement, these mounts help improve throttle response, shifting feel, and overall drivetrain control.
Upgraded mounts are commonly used in both street performance builds and track-driven vehicles. While stiffer mounts can introduce additional noise, vibration, and harshness (NVH), many options are engineered to balance comfort and performance for daily-driven cars.
For builds running higher boost, upgraded turbos, or other drivetrain-focused upgrades, engine mounts help maintain stability under torque. If you are planning a full engine build, pairing mounts with proven IAG Performance components can further strengthen reliability and drivetrain consistency.
Choosing the Right Motor Mounts
Selecting the correct engine mount depends on your vehicle’s model, engine platform, and intended use. Street-focused builds typically prioritize comfort and longevity, while higher-power or competition setups benefit from increased rigidity and control. If you need help choosing the right setup, start with your vehicle hub: WRX, STI, or Forester XT.
If you're planning performance upgrades for your Subaru, understanding how drivetrain components work together can help you build a more reliable setup. Our guide on how much boost is safe on a stock WRX and STI explains how increasing boost affects engine stress and supporting components. You can also explore how Subaru’s modern turbo engines compare in our article on FA20 vs FA24 engines, understand how fueling upgrades support higher power builds in our guide to fuel pumps vs injectors, and learn how tuning ties everything together in our article on what EFI tuning actually does for your WRX.
Frequently Asked Questions About Engine Mounts
Do upgraded engine mounts increase vibration?
Yes, stiffer performance engine mounts may increase vibration compared to factory mounts. Street-focused options are designed to balance improved stability with manageable NVH for daily driving.
Are upgraded engine mounts necessary for a tuned WRX or STI?
For vehicles running increased boost, upgraded turbochargers, or other engine performance parts, stronger mounts help control drivetrain movement and improve power delivery consistency under load.
When should I replace factory motor mounts?
Factory mounts should be replaced if you notice excessive engine movement, drivetrain clunking, or visible cracking in the rubber bushings. Performance builds often upgrade mounts proactively.
Can bad engine mounts cause wheel hop?
Yes. Worn or soft factory mounts can allow excessive drivetrain movement, which may contribute to wheel hop during hard launches. Upgraded performance mounts help stabilize engine movement and improve traction consistency.
Engine Mounts for High-Boost and Built Engine Setups
As power levels increase through upgraded turbochargers, ethanol fueling, or built short blocks, drivetrain movement becomes more pronounced. Reinforced engine mounts help maintain proper alignment under torque, improving traction consistency and reducing stress on surrounding components.
For full engine builds, pairing upgraded mounts with components from IAG Performance ensures the drivetrain is supported as a complete system.
Popular Engine Mount Brands for Subaru
- IAG Performance – Engineered for high-horsepower Subaru builds with a focus on strength and drivetrain stability.
- COBB Tuning – Balanced street and performance-oriented solutions designed for WRX and STI applications.
- Mishimoto – Performance-focused mounts and drivetrain components designed for durability and improved power transfer in turbocharged applications.
Explore compatible options above based on your vehicle platform and build goals.
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