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Spec Clutch SP521 Stage Performance Clutch Kit - 1

(1981-1988 Porsche 911; 1978-1979 Porsche 930)

Manufacturer

Picture for manufacturer Spec Clutch

Part Number

SP521
5 reviews
Sale Price

$899.49

Estimated ship date Wednesday, November 25

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Live-in-stock inventory

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Fitment guaranteed

Fitment guaranteed

Product Details

The Spec Clutch SP521 Stage 1 Clutch Kit is engineered for bolt-on naturally aspirated engines and mildly modified forced induction applications. Designed to deliver stock-like daily drivability combined with excellent wear characteristics, it represents the ideal step up from a worn OEM clutch without sacrificing pedal feel or day-to-day usability.

The Stage 1 kit features SPEC's signature high-clamp pressure plate paired with a steel-backed, multi-compound woven organic disc — an integrally molded high-performance organic lining that provides smooth engagement and extended service life. The high-torque sprung hub assembly uses a double-sprung design with spring cover reliefs for added flexibility, along with heat-treated components for long-term strength and durability.

Kit Includes:

  • High-clamp performance pressure plate
  • Steel-backed multi-compound woven organic clutch disc
  • High-torque sprung hub and disc assembly
  • Release bearing
  • Alignment tool

Suitable Driving Applications:

  • Street / Daily Driving
  • Drag Racing
  • Drifting
  • Road Racing
  • Rallye
  • Pulling
  • Autocross

Designed, hand-built, and tested in the USA, SPEC clutch kits are manufactured to strict tolerances for consistent performance and reliability. The SP521 Stage 1 is the perfect upgrade for drivers who want real performance holding power without giving up the comfortable, progressive engagement of a street clutch.

Products specifications

Fits

1981-1988 Porsche 911; 1978-1979 Porsche 930

Torque Capacity

485 ft/lbs

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I was hesitant to order from Autoplicity due to the perception that the price was too good to be real (and not some scam). However, I read a few reviews on the internet and decided to take a chance. Once I placed my order I was sent a tracking number and received my car parts within 2 weeks. I was happy that I got the parts I ordered and the price was really low. Simple and quick.

quick easy checkout and the cheapest shipping by far

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