£61.19

K&N DU-9321 Replacement Air Filter

DU-9321

Price data last checked 119 day(s) ago - refreshing...

View at Amazon

We'll watch every seller, every day. One email when your price arrives.

This is the most expensive it has ever been. Walk away.

£61 today · previous high £61 · all-time low £41

NEW HERE?

Amazon shows you one price. We show you all of them.

Tosheroon watches Amazon prices so you don't have to. Every product on Amazon has a price history — we make it visible. Set the price you'd actually pay, and we'll email you the second it gets there. No app, no account, one email.

WHAT'S ON THIS PAGE

↓ Price chart
when this has been cheap or pricey
↓ Forecast
where the price is heading next
↓ Statistics
all-time high & low, recent range
↑ Price alert
name your number, we'll email you

Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 158 days • 140 data points (No recent data available)

Historical
Generating forecast...
£61.19 £38.43 £43.40 £48.36 £53.33 £58.29 £63.26 01 September 2025 10 October 2025 18 November 2025 27 December 2025 05 February 2026

Price Distribution

Price distribution over 158 days • 5 price ranges

Days at Price
Current Price
6 days 7 days 30 days 33 days 64 days · current 0 16 32 48 64 £41-45 £45-49 £49-53 £53-57 £57-61 Days at Price

Price Analysis

Most common range: £57-61 (64 days, 45.7%)

Price range: £41 - £61

Price levels: 5 price ranges over 140 days

Description

K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's No-Hassle Lifetime Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!

Key Features

INCREASED HORSEPOWER AND ACCELERATION: K&N's 4 layer Oiled Cotton Gauze enables maximum airflow whilst maintaining maximum filtration.

WASHABLE AND REUSABLE: designed to last the lifetime of your vehicle.

CLEAN ONCE EVERY 5 YEARS: Engine air filter only needs cleaning every 75,000 miles under normal highway driving conditions (5 years based on the average miles driven per year of 15,000 miles)

REUSABLE K&N FILTERS SAVE YOU MONEY: A K&N washable, reusable air filter will save you up to £125 vs. purchasing multiple disposable filters (compared to MSRP in GBP of corresponding OE filters for 200,000 miles of highway driving)

EASY, FAST FIT: Fits directly into OEM air box.

Product Specifications

Brand
K&N
Model
DU-9321
Format
Automotive
Domain
Amazon UK
Release Date
27 November 2023
Listed Since
27 November 2023

Barcode

No barcode data available

Similar Products You Might Like

K&N HA-2519XD Replacement Air Filter
99% match

K&N HA-2519XD Replacement Air Filter

K&N

£56.66 29 Jan 2026
K&N HA-5221 Replacement Air Filter
99% match

K&N HA-5221 Replacement Air Filter

K&N

£55.02 18 Feb 2026
K&N E-0632 Replacement Air Filter
99% match

K&N E-0632 Replacement Air Filter

K&N

£111.15 16 Feb 2026
K&N HA-1120 Replacement Air Filter, Red
99% match

K&N HA-1120 Replacement Air Filter, Red

K&N

£115.60 08 Feb 2026
K&N HA-1122 Replacement Air Filter
99% match

K&N HA-1122 Replacement Air Filter

K&N

£42.01 07 Feb 2026
K&N 33-3188 Replacement Air Filter
99% match

K&N 33-3188 Replacement Air Filter

K&N

£86.04 29 Jan 2026
K&N 33-5103 Replacement Air Filter
98% match

K&N 33-5103 Replacement Air Filter

K&N

£56.66 28 Jan 2026
K&N E-9083 Washable and Reusable Car Air Filter/Direct Kits
98% match

K&N E-9083 Washable and Reusable Car Air Filter/Direct Kits

K&N

£73.45 31 Jan 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Replacement Engine Filter: Flange Diameter: 4 375 In, Filter Height: 6 5 In, Flange Length: 1 25 In, Shape: Round Tapered, RU-5061
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Replacement Engine Filter: Flange Diameter: 4 375 In, Filter Height: 6 5 In, Flange Length: 1 25 In, Shape: Round Tapered, RU-5061

K&N

£69.36 11 Mar 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 2.844 In, Filter Height: 7.5 In, Flange Length: 4.35 In, Shape: Oval Tapered, RU-5063
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 2.844 In, Filter Height: 7.5 In, Flange Length: 4.35 In, Shape: Oval Tapered, RU-5063

K&N

£60.83 13 Jan 2026
K&N E-3491 Washable and Reusable Car Air Filter/Direct Kits
98% match

K&N E-3491 Washable and Reusable Car Air Filter/Direct Kits

K&N

£88.90 31 Jan 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2016-2019 SSANGYONG Rexton; 2013-2019 SSANGYONG Rodius; 2013-2019 SSANGYONG Stavic, 33-3135
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2016-2019 SSANGYONG Rexton; 2013-2019 SSANGYONG Rodius; 2013-2019 SSANGYONG Stavic, 33-3135

K&N

£65.35 18 Apr 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2018-2019 Honda Accord, 33-5074
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2018-2019 Honda Accord, 33-5074

K&N

£84.29 08 Jan 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2018-2019 Honda Accord, 33-5072
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2018-2019 Honda Accord, 33-5072

K&N

£79.85 29 Jan 2026
K&N Universal Clamp-On Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 4.375 In, Filter Height: 2.75 In, Flange Length: 0.875 In, Shape: Round Tapered, RC-9460
98% match

K&N Universal Clamp-On Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 4.375 In, Filter Height: 2.75 In, Flange Length: 0.875 In, Shape: Round Tapered, RC-9460

K&N

£50.86 16 Dec 2025
K&N Engine Air Filter: High Performance, Washable, Replacement Filter: Compatible with 2014-2018 DAIHATSU/MARUTI SUZUKI/SUZUKI/MAZDA (Cast, Wake, Alto, Hustler, Spacia, Wagon R, Carol, Flair) 33-3084
98% match

K&N Engine Air Filter: High Performance, Washable, Replacement Filter: Compatible with 2014-2018 DAIHATSU/MARUTI SUZUKI/SUZUKI/MAZDA (Cast, Wake, Alto, Hustler, Spacia, Wagon R, Carol, Flair) 33-3084

K&N

£61.99 12 Feb 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2016-2019 CADILLAC (CT6), 33-5052
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2016-2019 CADILLAC (CT6), 33-5052

K&N

£71.15 13 Jan 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2019-2020 HONDA (Insight), 33-5090
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Replacement Filter: Compatible with 2019-2020 HONDA (Insight), 33-5090

K&N

£61.99 13 Jan 2026
K&N Replacement air filter compatible with Kia Sorento 2.0/2.4/3.3 & Hyundai Santa Fe Sport 2.0/2.4 2016- (33-5075)
98% match

K&N Replacement air filter compatible with Kia Sorento 2.0/2.4/3.3 & Hyundai Santa Fe Sport 2.0/2.4 2016- (33-5075)

K&N

£87.81 22 Jan 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3500
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3500

K&N

£86.88 08 Jan 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3640
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3640

K&N

£88.90 08 Feb 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3745
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3745

K&N

£86.35 13 Jan 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3660
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3660

K&N

£115.60 07 Feb 2026
K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3009
98% match

K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3009

K&N

£65.83 04 Feb 2026