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Harmony 21st Key

Marsoni M251S
Sale price$250.00
Pay 4 payments of $62.50 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Harmony 21st KeyKey Dimensions: Key: 700mm x 350mm Stand: 800mm x 200mm Indicative sizing only as each key can be slightly different in size. Keys with no base have hooks on the back to hang on the wall. Please read our store terms and conditions prior to purchasing a key. Turn around time for keys bought straight off our website is 10 working days.
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Quick Dispatch:

Your Harmony 21st Key orders ship within 1-2 business days.

Delivery Options:

  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your Harmony 21st Key ships.

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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.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 1833 reviews
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D
Verified Purchase
Dennis
Dallas, US
★★★★★ 5
Can’t go wrong with KN
Been using for years in all my vehicles. One time pricey but then years of trouble free performance enhancing filtration for your engine. Five minutes to install on 24’ Honda Pilot.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
C
Verified Purchase
Chuck Johnson
New York, US
★★★★★ 5
Good value
It’s a K&N quality filter, enough said
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
S
Verified Purchase
Skip
New York, US
★★★★★ 5
It fits
Fit my car perfectly. Hopefully it lasts longer than normal filters.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2026
J
Verified Purchase
Jijy M. John
Pawtucket, US
★★★★★ 4
Air filter
Easy to install, correct fit
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Reviewed in the United States on June 27, 2023
V
Verified Purchase
VictorS
Boise, US
★★★★★ 5
Worth it!
Perfect fit for my 23 MDX, easy to install and great value for money. Dealership quoted me a ridiculous amount to replace the air filter. I would recommend everyone to DIY. Bought it together with the cabin air filter. Will definitely keep an eye on longevity. These are washable so probably wont need to buy for at least a couple years.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 10, 2025

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