Drivetrain› Clutches and Components

Competition Clutch

Competition Clutch 2004-2011 Subaru STI 15lb Steel Flywheel

$283.46

SKU: C008 2-721-ST

In Stock
In Stock
Ships by Nov 5
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Competition Clutch 2-721-ST is a lightweight steel flywheel designed for 2004-2019 Subaru WRX STI models with the 2.5L EJ257 engine and 6-speed manual transmission. It is constructed from a one-piece 4140 forged steel material and weighs 15.00 lbs.
Show original supplier description

Part #: 2-721-ST

Competition Clutch Lightweight Steel Flywheels (ST suffix) are recommended for naturally aspirated and/or street-driven applications. This flywheel preserves low-end torque and driveability. Well-suited for Stage 1 and Stage 2 clutch applications. Made of 4140 forged steel and are a one-piece design. Not all applications have the ST and STU versions available. Flywheel weights vary from 8lbs to 18lbs depending on application.

Vehicle Symptoms
  • Sluggish throttle response under acceleration
  • Engine feels slow to rev up to redline
  • Difficult rev-matching during downshifts
  • Heavy clutch pedal feel in stop-and-go traffic
  • Car feels heavy off the line from a stop
Relevant Conversations
  • lightweight flywheel wrx sti 2005
  • competition clutch 2-721-ST review
  • how to install lightweight flywheel subaru
  • best lightweight flywheel for 04-19 sti
  • lightweight flywheel vs stock street driving
  • 15 lb flywheel vs 12 lb for daily driver
  • clutch and flywheel upgrade kit ej257
  • stretched flywheel bolts subaru symptoms
  • lightweight steel flywheel vs chromoly sti
  • does lightweight flywheel improve throttle response

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCompetition Clutch
Part NumberC008 2-721-ST

Videos

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy