£104.35

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3 In, Filter Height: 4.625 In, Flange Length: 0.875 In, Shape: Round Tapered, RX-3900-1

RX-3900-1

Price data last checked 50 day(s) ago - refreshing...

View at Amazon

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

It has never been this cheap. We have no record of a lower price.

£104 today · cheaper than every other day in the last 3 months

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 41 days • 41 data points (No recent data available)

Historical
Generating forecast...
£104.35 £99.13 £101.22 £103.31 £105.39 £107.48 £109.57 13 March 2026 23 March 2026 02 April 2026 12 April 2026 22 April 2026

Price Distribution

Price distribution over 41 days • 1 price levels

Days at Price
41 days 0 10 21 31 41 £104 Days at Price

Price Analysis

Most common price: £104 (41 days, 100.0%)

Price range: £104 - £104

Price levels: 1 different prices over 41 days

Key Features

ENGINEERED POWER: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.

EASY INSTALLATION: Pre-oiled and built with simple clamp-on design. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains.

International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

Product Specifications

Brand
K&N
Domain
Amazon UK
Release Date
15 October 2015
Listed Since
25 January 2011

Barcode

No barcode data available

Similar Products You Might Like

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3 In, Filter Height: 7 In, Flange Length: 0.625 In, Shape: Round, RX-2820
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3 In, Filter Height: 7 In, Flange Length: 0.625 In, Shape: Round, RX-2820

K&N

£107.99 23 Apr 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Filter: Flange Diameter: 3 In, Filter Height: 8.688 In, Flange Length: 0.938 In, Shape: Round Tapered, RX-3990-1
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Filter: Flange Diameter: 3 In, Filter Height: 8.688 In, Flange Length: 0.938 In, Shape: Round Tapered, RX-3990-1

K&N

£90.03 30 Jan 2026
K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 2.5 In, Filter Height: 6.5 In, Flange Length: 2 In, Shape: Round Tapered, RX-4860
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 2.5 In, Filter Height: 6.5 In, Flange Length: 2 In, Shape: Round Tapered, RX-4860

K&N

£145.00 10 Jan 2026
K&N X-Stream Top Air Filter: High Performance, Premium, Washable, Replacement Engine Filter: Shape: Round, 66-3150
98% match

K&N X-Stream Top Air Filter: High Performance, Premium, Washable, Replacement Engine Filter: Shape: Round, 66-3150

K&N

£184.98 09 Feb 2026
K&N Filters RX-4960 Car and Motorcycle Universal X-Stream Clamp-On
98% match

K&N Filters RX-4960 Car and Motorcycle Universal X-Stream Clamp-On

K&N

£81.98 09 Feb 2026
K&N Filters RX-4140 Car and Motorcycle Universal X-Stream Clamp-On
98% match

K&N Filters RX-4140 Car and Motorcycle Universal X-Stream Clamp-On

K&N

£145.00 10 Feb 2026
K&N X-Stream Top Filter: High Performance, Premium, Washable, Replacement Engine Filter: Filter Height: 1 In, Shape: Round Lid, 66-1401XP
98% match

K&N X-Stream Top Filter: High Performance, Premium, Washable, Replacement Engine Filter: Filter Height: 1 In, Shape: Round Lid, 66-1401XP

K&N

£134.99 29 Apr 2026
K&N X-Stream Top Air Filter: High Performance, Premium, Washable, Replacement Engine Filter: Shape: Round, 66-3030
98% match

K&N X-Stream Top Air Filter: High Performance, Premium, Washable, Replacement Engine Filter: Shape: Round, 66-3030

K&N

£271.03 25 Jan 2026
K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3.3125 In, Filter Height: 4.25 In, Flange Length: 0.9375 In, Shape: Round, RX-4120-1
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3.3125 In, Filter Height: 4.25 In, Flange Length: 0.9375 In, Shape: Round, RX-4120-1

K&N

£92.18 28 Jan 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3.5 In, Filter Height: 5.5 In, Flange Length: 0.75 In, Shape: Oval Tapered, RU-5040
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3.5 In, Filter Height: 5.5 In, Flange Length: 0.75 In, Shape: Oval Tapered, RU-5040

K&N

£56.48 24 Jan 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 2.75 In, Filter Height: 5 In, Flange Length: 0.75 In, Shape: Round Tapered, RU-5284
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 2.75 In, Filter Height: 5 In, Flange Length: 0.75 In, Shape: Round Tapered, RU-5284

K&N

£60.83 07 Mar 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3.938 In, Filter Height: 4.438 In, Flange Length: 0.75 In, Shape: Tapered Conical, RU-5059
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3.938 In, Filter Height: 4.438 In, Flange Length: 0.75 In, Shape: Tapered Conical, RU-5059

K&N

£99.86 23 Jan 2026
K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3 In, Filter Height: 6.5 In, Flange Length: 1.75 In, Shape: Round Tapered, RX-4730XD
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3 In, Filter Height: 6.5 In, Flange Length: 1.75 In, Shape: Round Tapered, RX-4730XD

K&N

£142.25 17 Apr 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3 In, Filter Height: 6 In, Flange Length: 1.75 In, Shape: Tapered Round, RU-4650
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3 In, Filter Height: 6 In, Flange Length: 1.75 In, Shape: Tapered Round, RU-4650

K&N

£64.24 28 Jan 2026
K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3.8125 In, Filter Height: 2.125 In, Flange Length: 0.75 In, Shape: Round, RX-4130-1
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 3.8125 In, Filter Height: 2.125 In, Flange Length: 0.75 In, Shape: Round, RX-4130-1

K&N

£123.95 29 Jan 2026
K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 2.4375 In, Filter Height: 6.125 In, Flange Length: 0.875 In, Shape: Round, RX-3810XD
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 2.4375 In, Filter Height: 6.125 In, Flange Length: 0.875 In, Shape: Round, RX-3810XD

K&N

£92.87 31 Jan 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 2.75 In, Filter Height: 8 In, Flange Length: 0.75 In, Shape: Tapered Round, RU-5144
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 2.75 In, Filter Height: 8 In, Flange Length: 0.75 In, Shape: Tapered Round, RU-5144

K&N

£99.90 11 Jun 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 6.98 In, Filter Height: 8 In, Flange Length: 1 In, Shape: Oval Tapered, RU-5292
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 6.98 In, Filter Height: 8 In, Flange Length: 1 In, Shape: Oval Tapered, RU-5292

K&N

£104.16 04 Mar 2026
K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance, Premium, Washable: Flange Diameter: 3.5 In, Filter Height: 7 In, Flange Length: 1.75 In, Shape: Oval Tapered, RU-1033
98% match

K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance, Premium, Washable: Flange Diameter: 3.5 In, Filter Height: 7 In, Flange Length: 1.75 In, Shape: Oval Tapered, RU-1033

K&N

£86.43 03 Mar 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Replacement Engine Filter: Flange Diameter: 4.5 In, Filter Height: 3.25 In, Flange Length: 0.625 In, Shape: Round Tapered, RU-3110
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Replacement Engine Filter: Flange Diameter: 4.5 In, Filter Height: 3.25 In, Flange Length: 0.625 In, Shape: Round Tapered, RU-3110

K&N

£71.67 29 Jan 2026
K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance, Premium: Flange Diameter: 3.5 In, Filter Height: 6.5 In, Flange Length: 1.75 In, Shape: Round Tapered, RU-4630XD
98% match

K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance, Premium: Flange Diameter: 3.5 In, Filter Height: 6.5 In, Flange Length: 1.75 In, Shape: Round Tapered, RU-4630XD

K&N

£85.53 16 Feb 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 4 In, Filter Height: 14 In, Flange Length: 1.75 In, Shape: Round Tapered, RE-0880
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 4 In, Filter Height: 14 In, Flange Length: 1.75 In, Shape: Round Tapered, RE-0880

K&N

£78.19 26 Jan 2026
K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3.25 In, Filter Height: 8 In, Flange Length: 1.625 In, Shape: Round Tapered, RU-5122
98% match

K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable, Replacement Filter: Flange Diameter: 3.25 In, Filter Height: 8 In, Flange Length: 1.625 In, Shape: Round Tapered, RU-5122

K&N

£96.08 23 Jan 2026
K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 2.5 In, Filter Height: 5.5 In, Flange Length: 2 In, Shape: Round Tapered, RX-4950
98% match

K&N Universal X-Stream Clamp-On Air Filter: High Performance, Premium, Replacement Filter: Flange Diameter: 2.5 In, Filter Height: 5.5 In, Flange Length: 2 In, Shape: Round Tapered, RX-4950

K&N

£145.43 11 Jan 2026