What is the main benefit of a Stage 3 clutch kit over stock?

A Stage 3 clutch kit, like this SPEC SF503-9, is built to handle significantly more torque than your factory clutch. This makes it suitable for Mustangs that have performance modifications like turbochargers or superchargers, or have had extensive engine work done.

Does this clutch kit come with a new flywheel?

This SPEC Stage 3 clutch kit includes the clutch disc and pressure plate. It is designed to work with your existing flywheel, though it's always recommended to inspect your flywheel for wear and resurface or replace it if necessary during installation.

Will this clutch kit feel much heavier than the stock clutch?

While this is a performance clutch designed for higher torque capacity, the sprung disc helps to absorb some of the engagement shock. Pedal feel can vary, but it is generally firmer than a stock clutch due to the increased clamping force required.

Specifications

Brand: SPEC
Part #: SF503-9

Spec 11-13 Ford Mustang 5.0L GT/Boss 9-Bolt Cover Stage 3 Clutch Kit

Name: Spec 11-13 Ford Mustang 5.0L GT/Boss 9-Bolt Cover Stage 3 Clutch Kit
Brand: SPEC
SKU: spec-spec-11-13-ford-mustang-5-0l-gt-boss-9-bolt-cover-stage-3-clutch-kit-t14-4316994
Price: 458.27 USD
Availability: BackOrder

$458.27

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2011-2014 Ford Mustang 5.0L GT/Boss. This Stage 3 clutch kit from SPEC is built for improved holding power.

Key Features

Fits 2011-2014 Ford Mustang 5.0L GT and Boss models with the 9-bolt cover.
Stage 3 performance clutch kit designed for increased torque holding capacity.
Includes a high-performance sprung disc for improved engagement characteristics.
Features a heavy-duty pressure plate for consistent clamping force.
Well-built components to handle upgraded power levels.

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About this part

Product Details

If you're looking to handle more power in your 2011-2014 Ford Mustang GT or Boss with the 5.0L engine and the 9-bolt cover, this SPEC Stage 3 clutch kit is a solid option. This kit is designed to hold significantly more torque than the stock clutch, making it a popular choice for Mustangs that have seen performance upgrades like forced induction or extensive engine work.

SPEC builds this Stage 3 kit with a high-performance sprung disc and a heavy-duty pressure plate. The sprung disc helps absorb some of the shock and vibration that can come with a more aggressive clutch, offering a slightly more comfortable engagement than a solid hub design, while still providing the clamping force needed for demanding applications. The pressure plate is well-built to ensure consistent engagement and reliable power transfer, even when you're putting down serious torque.

When installing a clutch kit like this, it's always a good idea to inspect your flywheel for any signs of wear or damage. You'll also want to ensure you have the proper alignment tools for a smooth installation. This kit is a direct replacement for the factory clutch, but it's engineered for a higher performance threshold.