How much more does the HD EXEDY Stage 2 Cerametallic Clutch hold on an STI?

EXEDY rates the 15951HD at 548 lb-ft of torque capacity at the wheels against 386 lb-ft for the standard 15951, because clamp load rises from 2,536 lb to 3,597 lb. Flywheel torque moves from 482 to 685 lb-ft on the same 240 mm disc and spline.

Who needs the HD STI clutch?

An STI or spec.B with a large turbo, ethanol fuel or regular launch control use, where the standard kit would be near its limit. Below that level the standard 15951 holds the power with a noticeably lighter pedal and is easier to live with in traffic.

Will the HD clutch make the pedal much heavier?

Yes. Clamp load rises by more than 1,000 lb over the standard kit, so pedal effort increases clearly. Inspect the master and slave cylinders and the release fork pivot during installation, since a heavier clutch exposes wear in the release system.

Does the HD kit fit the VA WRX STI?

Yes. Turn 14 lists this EXEDY Stage 2 Cerametallic Clutch, the 15951HD, for the 2017-2019 VA WRX STI, including the Type RA and S209, along with the 2004-2014 Impreza WRX STI and the 2007-2009 Legacy GT spec.B, all with the six-speed manual and pull-type release.

Single disc HD or twin disc for a big-turbo STI?

A single thick disc keeps engagement and noise closer to stock and costs less to service than a twin-plate clutch. Twin-disc clutches hold more torque in the same space and suit very high outputs. The HD single disc covers most big-turbo street and track cars.

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Description

EXEDY Stage 2 Cerametallic Clutch Kit for Subaru WRX STI and Legacy GT spec.B (HD Thick Disc)

EXEDY’s Stage 2 Cerametallic Clutch Kit for Subaru WRX STI and Legacy GT spec.B in HD form raises clamp load to 3,597 lb for the EJ257 running a big turbo, ethanol or both. EXEDY rates it at 685 lb-ft at the flywheel and 548 lb-ft at the wheels, a large step over the standard kit on the same 240 mm thick disc and pull-type release.

Design and Performance

Compared with the standard 15951, the HD cover moves clamp load from 2,536 to 3,597 lb, clutch torque from 607 to 860 lb-ft and flywheel torque from 482 to 685 lb-ft, by EXEDY figures. Disc size, facing and spline are unchanged. Pedal effort rises with the clamp load, and the six-speed and rear differential take more of the engine output as a result.

Features

EXEDY Stage 2 Cerametallic Clutch with a thick disc, HD cover
Heavy-duty ductile-cast pressure plate, 3,597 lb
Pull-type design for the six-speed release system
Sprung center damper to protect the AWD driveline
SFI 1.1 compliant, according to EXEDY

Specifications

Disc diameter: 240 mm
Input spline: 24 tooth, 25.2 mm
Clamp load: 3,597 lb
Clutch torque capacity: 860 lb-ft
Torque capacity at the flywheel: 685 lb-ft
Torque capacity at the wheels: 548 lb-ft

Applications

Subaru Impreza WRX STI: GD / GR / GV | 2004-2014 | 2.5L H4 turbo (including Limited and Special Edition)
Subaru Legacy GT spec.B: 2007-2009 | 2.5L H4 turbo
Subaru WRX STI: VA | 2017-2019 | 2.5L H4 turbo (including Limited, Type RA and S209)

Notes

Turn 14 lists this kit as a pull-type clutch for the six-speed cars
Turn 14 also lists a 2007 Legacy 2.5i Special Edition, a non-turbo model, which is left out here; the VA WRX STI is listed for 2017-2019 only
For a lighter pedal at lower power, see the standard EXEDY Stage 2 Cerametallic Clutch Kit for the WRX STI with thick disc

Frequently Asked Questions

How much more does the HD EXEDY Stage 2 Cerametallic Clutch hold on an STI? EXEDY rates the 15951HD at 548 lb-ft of torque capacity at the wheels against 386 lb-ft for the standard 15951, because clamp load rises from 2,536 lb to 3,597 lb. Flywheel torque moves from 482 to 685 lb-ft on the same 240 mm disc and spline.
Who needs the HD STI clutch? An STI or spec.B with a large turbo, ethanol fuel or regular launch control use, where the standard kit would be near its limit. Below that level the standard 15951 holds the power with a noticeably lighter pedal and is easier to live with in traffic.
Will the HD clutch make the pedal much heavier? Yes. Clamp load rises by more than 1,000 lb over the standard kit, so pedal effort increases clearly. Inspect the master and slave cylinders and the release fork pivot during installation, since a heavier clutch exposes wear in the release system.
Does the HD kit fit the VA WRX STI? Yes. Turn 14 lists this EXEDY Stage 2 Cerametallic Clutch, the 15951HD, for the 2017-2019 VA WRX STI, including the Type RA and S209, along with the 2004-2014 Impreza WRX STI and the 2007-2009 Legacy GT spec.B, all with the six-speed manual and pull-type release.
Single disc HD or twin disc for a big-turbo STI? A single thick disc keeps engagement and noise closer to stock and costs less to service than a twin-plate clutch. Twin-disc clutches hold more torque in the same space and suit very high outputs. The HD single disc covers most big-turbo street and track cars.

About EXEDY

EXEDY Corporation of Neyagawa, Osaka, traces its clutch business back to 1923 and built its name as Daikin Clutch before adopting the EXEDY brand. It is a leading original-equipment maker of clutches and powertrain parts, and its racing line supplies Hyper Series multi-plate clutches for drag, circuit and rally use. EXEDY Globalparts Corporation, its wholly owned US subsidiary, supports the range in North America.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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EXEDY Stage 2 Cerametallic Clutch Kit for Subaru WRX STI and Legacy GT spec.B (HD Thick Disc) [15951HD]

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EXEDY Stage 2 Cerametallic Clutch Kit for Subaru WRX STI and Legacy GT spec.B (HD Thick Disc)

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About EXEDY

Reviews