If you're looking for a clutch kit that can handle the heat of serious driving, the ACT HD/Race Sprung 6 Pad Kit FM13-HDG6 is worth a closer look. This kit is built around ACT's Heavy Duty pressure plate, which is a favorite among performance enthusiasts. The design is pretty ingenious; it uses a unique diaphragm that boosts clamp load and minimizes deflection. That means you get a clutch that lasts longer and performs better under pressure.

What really sets this kit apart is the four-stage heat-treating process that each diaphragm goes through. This isn't just some assembly line product; it's engineered for serious performance. The pressure plates are crafted with precision cover stampings, ensuring they’re rigid and consistent—essential for any high-stakes driving scenario.

Now, onto the 6-pad, spring-centered race disc. This thing is a beast. It’s designed to dampen torsional vibrations, which is a fancy way of saying that it helps keep everything running smoothly, even when you’re pushing your ride to the limits. Engagement might feel a bit harsher—so don’t expect a cushy, soft feel—but that’s the trade-off for faster shifts. If you’ve got a high-horsepower setup, this disc can handle the heat and then some, making it perfect for street or race use.

Here’s a quick rundown of what you can expect:

• Light to moderate pedal effort with aggressive engagement—ideal for those who like to feel connected to their ride.
• Moderate friction life, which is extended thanks to ACT's clever diaphragm design.
• Precision engineering means you get a clutch that’s balanced and built to last, using select ceramic friction materials that can take the heat.
• It’s been clamp load tested and dynamically balanced, so you know it’s reliable even at high RPMs.

As for the specs, this kit comes with:

• Clutch disc diameter of 11 inches (or 280 mm for those who prefer metric).
• A robust torque capacity of 770 ft/lbs, which is a solid upgrade over stock.
• Input spline quantity of 23 and a 1-inch input shaft diameter, making it compatible with a range of setups.
• And yes, it comes with grease and an alignment tool—just not the clutch master cylinder or slave cylinder.

Just a heads-up: if you're installing this clutch kit on an OE flywheel, make sure to use the conversion dowels that come with the pressure plate. It’s a small detail, but it can save you a headache down the road.

This kit fits a range of Ford Mustangs from 2010 to 2022, including the Boss 302 and GT models. So if you’re serious about performance and want something that can really take a beating, the ACT HD/Race Sprung 6 Pad Kit is definitely worth considering.