Best Engine Mount Upgrades for WRX & STI

Engine mounts are one of the most overlooked upgrades on the Subaru WRX and STI, yet they play a critical role in how the car feels, shifts, and puts power down.

From daily driving to aggressive performance builds, upgrading engine mounts can transform drivetrain response and improve overall control.

If you are driving a Subaru WRX or Subaru STI, understanding how engine mounts work and when to upgrade them is essential for getting the most out of your setup.

Engine mounts are one of the most effective supporting upgrades for any build. If you are still mapping out your full setup, our WRX performance upgrades guide covers how all the key modifications work together and where engine mounts fit into the bigger picture.

What Do Engine Mounts Actually Do?

Engine mounts secure the engine to the chassis while absorbing vibrations. Factory mounts are designed to prioritize comfort, which means they allow a noticeable amount of engine movement under load.

When you accelerate, shift, or apply boost, the engine physically moves. This movement can reduce responsiveness, affect shifting precision, and introduce instability in high-performance scenarios.

Upgraded mounts reduce that movement, keeping the drivetrain more stable and improving how power is transferred to the wheels.

Why Upgrade Engine Mounts on a WRX or STI?

As power increases, engine movement becomes more noticeable. This is especially true on turbocharged platforms where torque loads can be significant.

Upgrading engine mounts provides several key benefits:

• Improved throttle response
• More precise gear shifts
• Reduced drivetrain slop
• Better power transfer under load
• Increased stability during aggressive driving

These improvements become even more important if you are running higher boost levels. Our boost safety guide explains how torque increases with boost and why drivetrain control becomes critical.

Stock vs Upgraded Engine Mounts

Factory engine mounts are typically made from soft rubber. This helps reduce vibration and noise, but it allows significant engine movement.

Upgraded mounts use stiffer rubber compounds or polyurethane to limit that movement. The result is a more direct driving experience, but with a slight increase in vibration and noise.

This trade-off is important. Choosing the right mount depends on how you use the car.

Types of Engine Mount Upgrades

Performance Rubber Mounts

Performance rubber mounts are a popular choice for daily drivers. They offer increased stiffness compared to stock while maintaining reasonable comfort.

This makes them ideal for street-driven WRX and STI builds that want better responsiveness without excessive vibration.

Polyurethane Engine Mounts

Polyurethane mounts are significantly stiffer and designed for performance-focused setups.

They reduce engine movement more aggressively, which improves drivetrain precision but increases NVH (noise, vibration, harshness).

These are better suited for track use or high-power builds where control is more important than comfort.

Solid Mounts (Race Applications)

Solid mounts eliminate engine movement almost entirely. However, they transmit a large amount of vibration into the chassis.

These are typically reserved for dedicated race builds and are not recommended for daily driving.

How Engine Mounts Affect Shifting and Drivability

One of the biggest benefits of upgraded engine mounts is improved shifting feel.

When the engine moves less, the transmission stays more aligned with the drivetrain. This results in more consistent and precise gear engagement.

This becomes even more noticeable when paired with clutch upgrades. Our clutch upgrade guide explains how drivetrain components work together under load.

When Should You Upgrade Engine Mounts?

Engine mounts are not always the first modification, but they become important as performance increases.

You should consider upgrading if:

• You notice excessive engine movement under acceleration
• Shifting feels inconsistent or sloppy
• You are increasing power with bolt-on mods or turbo upgrades
• You want a more connected driving experience

If you are already upgrading airflow and boost, mounts become even more relevant. Our boost control guide explains how increased torque affects the drivetrain.

Engine Mounts and High-Performance Builds

As builds move toward higher horsepower levels, drivetrain stability becomes critical.

Managing drivetrain stability is also a key part of long-term engine health. Our WRX engine reliability guide explains how supporting modifications like mounts reduce stress on internals and contribute to a more durable build.

Engine movement can lead to inconsistent power delivery, added stress on components, and reduced control during aggressive driving.

This is especially important when running upgraded turbos or built engines. If you are considering a turbo upgrade, our stock vs upgraded turbo guide explains how increased torque affects drivetrain components and why stability upgrades become critical at higher power levels.

If you are planning a more serious setup, combining mounts with reinforced internals is a common approach. IAG Performance components are designed to handle higher stress levels and support long-term reliability.

For builds pushing beyond stock limits, exploring options like IAG short blocks ensures the engine itself can handle the added load.

Best Engine Mount Options for WRX & STI

Choosing the right mount depends on your goals and how the car is used.

For daily drivers, performance rubber mounts provide a strong balance between comfort and control.

For aggressive street or track builds, polyurethane mounts offer maximum drivetrain stability.

For daily drivers, performance rubber mounts provide a strong balance between comfort and control. For aggressive street or track builds, polyurethane mounts offer maximum drivetrain stability. You can explore the full range of performance engine mounts for WRX and STI designed to handle increased torque and improve overall driving precision.

Supporting Mods That Work With Engine Mounts

Engine mounts are most effective when paired with other supporting upgrades.

Common complementary modifications include:

• Clutch upgrades for improved power transfer
• Transmission mounts for drivetrain alignment
• Exhaust systems for improved airflow
• Proper tuning to manage torque delivery

Improving airflow also plays a role in overall performance. Pairing mounts with proper WRX exhaust upgrades helps optimize engine efficiency and complements drivetrain stability at higher power levels.

Understanding how tuning affects torque delivery is also important. Our EFI tuning guide explains how power is managed across the rev range.

Final Thoughts

Engine mounts may not be the most visible upgrade, but they have a major impact on how your WRX or STI feels and performs.

By reducing engine movement, they improve responsiveness, shifting precision, and overall drivetrain stability.

Whether you are building a daily driver or a high-performance setup, upgrading engine mounts is one of the most effective ways to improve driving feel and control.