Cobb Rear Motor Mount - 2007-2013 Mazdaspeed3 / 2013-2018 Ford Focus ST (891010)

Tighten up your Mazdaspeed3 or Focus ST's drivetrain with the Cobb rear motor mount. The 891010 replaces the factory rear motor mount with a stiffer, more durable unit that reduces engine movement under power — improving power delivery consistency, reducing torque steer, and providing a more connected, responsive driving feel. A foundational upgrade for any performance-oriented Mazdaspeed3 or Focus ST build.

Note: Stiffer motor mounts will increase NVH (noise, vibration, harshness) transmission into the cabin compared to factory mounts. This is a normal characteristic of performance motor mounts and is the trade-off for improved drivetrain rigidity.

Key Features:

• Cobb performance rear motor mount
• Reduces engine movement under power
• Direct fit for 2007-2013 Mazdaspeed3 and 2013-2018 Ford Focus ST
• Improved power delivery and drivetrain response
• Cobb Tuning quality and engineering
• 2.1 lbs

Performance Benefits:

• Reduced Engine Movement: Stiffer mount limits engine/transmission movement under acceleration, braking, and cornering — keeping the drivetrain more firmly located in the engine bay
• Improved Power Delivery: Less drivetrain flex means more consistent power transfer to the front wheels, particularly noticeable during hard acceleration and gear changes
• Reduced Torque Steer: Engine movement under power is a contributing factor to torque steer in FWD turbocharged vehicles — a stiffer rear mount helps reduce this tendency
• Better Shift Feel: Reduced drivetrain movement improves the feel and precision of gear changes
• Durability: Performance motor mount materials outlast factory rubber, particularly in high-power applications where the factory mount degrades more rapidly
• Consistent Performance: Reduced drivetrain flex provides more predictable, consistent power delivery for performance driving and track use

Specifications:

• Brand: Cobb Tuning
• Part Number: 891010
• Position: Rear motor mount
• Application: 2007-2013 Mazdaspeed3 / 2013-2018 Ford Focus ST
• Weight: 2.1 lbs
• Barcode: B891010

Fitment Information:

• 2007-2013 Mazda Mazdaspeed3 (BK/BL chassis — 2.3L MZR DISI turbocharged)
• 2013-2018 Ford Focus ST (2.0L EcoBoost turbocharged)
• Note: Rear motor mount position — verify if front and side mounts should also be upgraded for your application
• Note: Increased NVH is expected with performance motor mounts — verify this trade-off is acceptable for your intended use
• Installation: Professional installation recommended — motor mount replacement requires supporting the engine during installation

What's Included:

• Cobb rear motor mount (891010)
• Note: Hardware — verify if included with Cobb documentation

Installation Notes:

• Professional installation recommended
• Support the engine with a floor jack and block of wood before removing the factory mount
• Do not allow the engine to hang unsupported during mount replacement
• Inspect surrounding components (subframe, transmission, adjacent mounts) while the area is accessible
• Torque all fasteners to Cobb and OEM specifications
• Allow mount to settle before checking torque

Why Upgrade the Rear Motor Mount?

The factory motor mounts on the Mazdaspeed3 and Focus ST are designed to balance performance with comfort — they use soft rubber bushings that absorb vibration and reduce NVH transmission into the cabin, but this softness comes at the cost of drivetrain rigidity. Under the high torque loads of a turbocharged FWD engine — particularly a modified one making more power than stock — the factory mounts allow the engine and transmission to move significantly under acceleration. This movement has several negative effects: it creates inconsistency in power delivery as the drivetrain flexes and recovers, it contributes to torque steer as the engine's movement affects the geometry of the front driveshafts, and it accelerates wear on the factory mounts themselves as they are subjected to loads beyond their design intent.

A performance rear motor mount addresses these issues by using stiffer materials — typically a harder durometer polyurethane or solid aluminium with polyurethane inserts — that resist the engine's tendency to move under power. The result is a more firmly located drivetrain that delivers power more consistently, with less torque steer and more predictable handling. The trade-off is increased NVH transmission into the cabin, as the stiffer mount no longer absorbs as much vibration from the engine and drivetrain — a trade-off that performance drivers typically consider well worthwhile.

Mazdaspeed3 and Focus ST — Motor Mount Context:

The Mazdaspeed3 and Ford Focus ST share a common challenge: they are high-torque, turbocharged FWD vehicles where the factory motor mounts are a known weak point for performance use. The Mazdaspeed3's 2.3L MZR DISI engine produces 263 hp and 280 lb-ft of torque in factory form, while the Focus ST's 2.0L EcoBoost produces 252 hp and 270 lb-ft. Both engines produce substantial torque for FWD platforms, and the factory mounts — designed for a balance of performance and comfort — allow more engine movement than is ideal for performance driving. Motor mount upgrades are among the most popular and impactful modifications for both platforms, with owners consistently reporting improved power delivery, reduced torque steer, and a more connected driving feel after installation.

The rear motor mount is particularly important on these platforms as it is one of the primary restraints against the engine's tendency to rotate forward under acceleration (torque reaction). Upgrading the rear mount alone provides a meaningful improvement, though many owners choose to upgrade all three mounts (front, rear, and side/dog bone) simultaneously for the full benefit of a complete motor mount upgrade.

Complete Motor Mount Upgrade — Rear, Front, and Side:

While the Cobb rear motor mount provides a meaningful improvement on its own, the full benefit of a motor mount upgrade is realized when all three mounts are upgraded together. The front mount, rear mount, and side (dog bone) mount work together to locate the engine and transmission in the engine bay — upgrading only one mount shifts the load to the remaining factory mounts, which may then become the limiting factor. Cobb offers a complete motor mount kit for the Mazdaspeed3 and Focus ST — consider upgrading all three mounts simultaneously for the best result, particularly on higher-power builds where the factory mounts are under the most stress.

Why Cobb Tuning?

Cobb Tuning is one of the most respected names in performance tuning and hardware for turbocharged performance vehicles, with particular expertise in the Mazdaspeed3 and Ford Focus ST platforms. Their motor mounts are engineered specifically for these vehicles, providing the correct fitment, durometer, and design for the specific loads and geometry of the Mazdaspeed3 and Focus ST drivetrain. Cobb's deep platform knowledge — developed through years of tuning, racing, and product development on these specific vehicles — means their motor mounts are designed with a genuine understanding of what these platforms need for performance use.

Perfect For:

• 2007-2013 Mazdaspeed3 owners wanting reduced engine movement and improved power delivery for performance driving
• 2013-2018 Ford Focus ST owners experiencing torque steer and drivetrain flex under hard acceleration
• Mazdaspeed3 and Focus ST builds running increased power levels where factory motor mounts are a limiting factor
• Track day and autocross Mazdaspeed3/Focus ST builds wanting improved drivetrain rigidity and consistency
• Anyone wanting Cobb's quality rear motor mount upgrade for their Mazdaspeed3 or Focus ST

Perfect For: 2007-2013 Mazdaspeed3 and 2013-2018 Ford Focus ST owners seeking Cobb rear motor mount for reduced engine movement, improved power delivery, less torque steer, and more responsive drivetrain feel.

Pro Tip: If you're upgrading the rear mount, seriously consider doing all three mounts at the same time — the labour to access and replace motor mounts is the majority of the job cost, and doing all three in one visit is significantly more cost-effective than returning for the remaining mounts later. The full three-mount upgrade also provides a more balanced result than a single-mount upgrade.

Rear Mount | Performance | FWD Turbo: 2007-2013 Mazdaspeed3 / 2013-2018 Ford Focus ST. Increased NVH expected — normal for performance mounts. Support engine during installation. 2.1 lbs. Professional installation recommended.

Tighten up your Mazdaspeed3 or Focus ST's drivetrain with Cobb's rear motor mount — reduced engine movement, improved power delivery, less torque steer, direct fit for both platforms.