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Competition Clutch 2004-2011 Subaru STI 15lb Steel Flywheel

Marsoni M251S
Sale price$197.50
Pay 4 payments of $49.38 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Competition Clutch 2004-2011 Subaru STI 15lb Steel FlywheelSKU: P2 721 ST UPC: 887753963079 Competition Clutch 2004 2011 Subaru STI 15lb Steel Flywheel Competition Clutch Lightweight Steel Flywheel 2 721 ST delivers reduced rotational mass for quicker revs on 2004 2021 Subaru Impreza WRX STI and WRX STI models. This 15lb ST series unit maintains low end torque and smooth driveability ideal for naturally aspirated street use. Pair it with Gravity Stage 1 or Stage 2 clutches for reliable daily performance. Key
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
Based on 1024 reviews
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Gary0529
Natrona Heights, US
★★★★★ 5
It works!
Size: 16 Fl Oz (Pack of 1), Style: Individual
A short story long---LOL---My zero turn started acting quirky-it would not run at full power and would begin to stall when put under a full load - like trying to mow some taller or thicker grass- never did stall since I would immediately kill the mower but obviously it was not right. I checked and changed the fuel filters-this one has 2 . One in the pick up line in the tank and one is inline just before the fuel pump unit. No help! So, before I dropped the big bucks to have the local farm dealer come and pick it up (at $75 per pickup and return) plus h=whatever shop charges that would result I thought "What the heck, lets give this stuff a try" I gambled $6 . I put in 5 ounces for the 5 gallons tank, and filled it with the gas I had on hand- should have been relatively fresh gas -no more than 2 weeks since pumped . Well, whatever the cause of the issue within about 15 to 30 minutes of low speed running- mostly at idle - the engine seemed to be idling smoothly as opposed to before where it surged but never died, I gave it a try at mowing. YEA!!!! full power and no bogging down - I finished mowing the yard and a part of the pasture (not yet grown up much so it is not requiring the rotary cutter YET) My only guess is perhaps a batch of either old gas or some water in the gas can or mower tank but whatever the cause it fixed it --and all for $6.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 12, 2025
N
Verified Purchase
Nancy McKenzie
Lexington, US
★★★★★ 5
Convenient to order from Amazon
Size: 16 Fl Oz (Pack of 1), Style: Individual
Works as expected.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 25, 2026
T
Verified Purchase
Tommy Domino
Lowell, US
★★★★★ 4
Good product
Size: 16 Fl Oz (Pack of 1), Style: Individual
Works well for my lawnmower. It's running better after first time using.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 13, 2025
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Verified Purchase
HOWARD J ALLEN
Grantham, US
★★★★★ 5
Fuel stabilizer
Size: 16 Fl Oz (Pack of 1), Style: Individual
Great additive
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 21, 2026
R
Verified Purchase
Rusted Junk Garage
Massapequa, US
★★★★★ 5
Keeps the lawn equipment happy.
Size: 16 Fl Oz (Pack of 1), Style: Individual
I use this product in my lawn equipment to keep the carburetors clean.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 23, 2025

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