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  • K&N Universal Filter Round Tapered 4in FlangeID / 6.625in Base OD / 5.25in Top OD / 9.5in Height
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K&N Universal Filter Round Tapered 4in FlangeID / 6.625in Base OD / 5.25in Top OD / 9.5in Height

K&N Engineering
KNNRC-4780
In stock
Air Filters - Universal Fit
$78.99
K&N Universal Tapered Cone Filter (4" Flange | 9.5" Height) | RC-4780 Boost airflow and horsepower with the K&N Universal Round Tapered Air Filter (4"...
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$78.99
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K&N Universal Filter Round Tapered 4in FlangeID / 6.625in Base OD / 5.25in Top OD / 9.5in Height
Description

K&N Universal Tapered Cone Filter (4" Flange | 9.5" Height) | RC-4780

Boost airflow and horsepower with the K&N Universal Round Tapered Air Filter (4" Flange, 9.5" Height). Washable, reusable, high-flow performance design.

Engineered for maximum airflow and exceptional engine protection, this K&N Universal Clamp-On Air Filter (Part # RC-4780) is built for custom, high-performance applications. Featuring a round tapered cone design with a 4-inch inner diameter flange, a 6.625-inch base, a 5.25-inch top, and a massive 9.5-inch overall height, this filter maximizes surface area to feed hungry engines.

Constructed with premium multi-layered oiled cotton gauze sandwiched between zinc-coated wire mesh, it captures fine dust, dirt, and contaminants without choking off vital airflow. Its ultra-durable molded rubber flange flexes slightly to absorb engine vibrations and ensures a tight, leak-free seal on custom intake piping. Built to last for the life of your vehicle, this filter is fully washable and reusable—eliminating the need to buy disposable paper filters ever again.

Best Uses

  1. Custom Cold Air Intakes: Ideal for DIY intake projects using standard 4-inch intake tubing.
  2. Forced Induction Systems: Perfect filter upgrade for custom turbocharger or supercharger inlet pipes.
  3. Performance & Race Builds: Designed for track cars, hot rods, off-road rigs, and modified street vehicles that demand high airflow.
  4. Diesel Truck Air Systems: Excellent replacement filter for high-output diesel intake kits (such as Powerstroke, Cummins, or Duramax platforms).

Features

  1. High-Flow Cotton Media: Features multi-layer oiled cotton gauze designed to deliver up to 50% more airflow than standard paper filters.
  2. Pliable Rubber Flange: Vibration-absorbing molded rubber flange stretches up to 1/16" (1.5mm) for a tight, secure fit on 4-inch piping.
  3. Washable & Reusable: Designed to be cleaned and re-oiled repeatedly using a K&N Recharger kit, reducing waste and long-term costs.
  4. Tapered High-Capacity Cone: Deep-pleated 9.5-inch tall cone body maximizes surface area for prolonged service intervals before requiring maintenance.
  5. Heavy-Duty Construction: Built with internal wire mesh and robust top end caps for structural strength under heavy vacuum pressures.

Benefits

  1. Increases Horsepower & Acceleration: Reduces intake restriction to allow more oxygen into the engine, unlocking responsive power gains.
  2. Superior Engine Protection: Oiled media traps airborne dust and dirt particles to guard critical engine internals against premature wear.
  3. Saves Money Long-Term: Replaces dozens of disposable paper air filters over time with a single lifetime-durable unit.
  4. Simple Clamp-On Installation: Comes pre-oiled and ready to install directly onto a 4-inch intake pipe with a standard hose clamp.
  5. Eco-Friendly Choice: Significantly reduces landfill waste by eliminating single-use disposable filters.



This Part Fits:

 

Year Make Model Submodel
1994-2002 Dodge Ram 2500 Base
2003,2005-2007 Dodge Ram 2500 Laramie
2003-2004,2006-2007 Dodge Ram 2500 SLT
2006-2007 Dodge Ram 2500 Sport
2003-2004,2006-2007 Dodge Ram 2500 ST
2006-2007 Dodge Ram 2500 TRX4
1994-2002 Dodge Ram 3500 Base
2003-2007 Dodge Ram 3500 Laramie
2003-2007 Dodge Ram 3500 SLT
2006-2007 Dodge Ram 3500 Sport
2003-2007 Dodge Ram 3500 ST
2007 Dodge Ram 3500 TRX4
2003 Ford Excursion Eddie Bauer
2000-2003 Ford Excursion Limited
2000-2003 Ford Excursion XLT
1995-1996 Ford F-250 Eddie Bauer
1995-1996 Ford F-250 Special
1994-1996 Ford F-250 XL
1994-1996 Ford F-250 XLT
1997 Ford F-250 HD XL
1997 Ford F-250 HD XLT
1999-2003 Ford F-250 Super Duty Lariat
1999-2003 Ford F-250 Super Duty XL
1999-2003 Ford F-250 Super Duty XLT
1997 Ford F-350 Base
1995 Ford F-350 Eddie Bauer
1995-1996 Ford F-350 Special
1994-1997 Ford F-350 XL
1994-1997 Ford F-350 XLT
2003 Ford F-350 Super Duty King Ranch
1999-2003 Ford F-350 Super Duty Lariat
1999-2003 Ford F-350 Super Duty XL
1999-2003 Ford F-350 Super Duty XLT
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