K&N High-Flow Universal Clamp-On Air Filter RE-0870 — 4" Flange, 9" Tapered Cone, Washable High-Performance

K&N RE-0870 is a reusable, high-flow clamp-on air filter engineered to boost airflow and last the lifetime of your vehicle. K&N's Universal Clamp-On filters are built for broad compatibility and long-term performance. This RE-0870 model uses multi-layer cotton-gauze media and a pliable molded rubber flange to increase airflow, trap contaminants, and provide a secure connection to a variety of intake setups. Because it is washable and reusable, it replaces repeated purchases of disposable filters and reduces waste over the vehicle's life.

How does the RE-0870 improve engine breathing?

The RE-0870 is designed to increase volumetric airflow compared with standard paper filters. Its layered cotton gauze media permits higher airflow while still trapping dirt particles, which can translate to smoother throttle response and potential performance gains when paired with appropriate tuning.

• State-of-the-art cotton gauze media with four protective layers
• Pre-oiled for immediate use and optimized filtration
• Round tapered (cone) shape directs air efficiently into the intake

How do I install this clamp-on filter and what fit does it require?

Installation is straightforward: slide the filter's 4-inch molded rubber flange over the intake pipe or adapter, position, and secure with a clamp. The pliable flange helps absorb vibration and conforms to imperfect mating surfaces for a tight fit on many aftermarket and factory intakes.

• Flange diameter: 4.00 inches; flange length: 1.75 inches
• Filter height: 9.00 inches, tapered round profile
• Works with a wide variety of clamp-on intake pipes and adapters

What maintenance does the K&N RE-0870 need?

Unlike disposable filters, the RE-0870 is washable and reusable. Under normal highway use it typically only needs service every 75,000 miles (about five years for average driving), and the cleaning process is simple with K&N cleaning and re-oiling products.

• Clean every 75,000 miles under normal conditions (more often in dusty environments)
• Use K&N filter cleaner and oil for best results
• Durable construction supports many clean/re-oil cycles for long life

What are the build and warranty details?

The RE-0870 uses premium materials and manufacturing methods to resist wear over prolonged service. K&N backs this filter with a 1-year limited warranty and manufactures it in the USA, reflecting consistent quality control and standards.

• Constructed with ultra-strong molded rubber flange for vibration absorption
• 4 layers of cotton gauze treated with a tack agent to trap contaminants
• 1-Year limited warranty and made in the USA

Who is this for? This filter is aimed at vehicle owners, DIY mechanics, and performance enthusiasts who want a reusable, high-flow intake solution for a wide range of applications. It's a practical upgrade for anyone seeking improved airflow, lower long-term operating costs, and reduced disposable-waste from frequent filter replacements. If you use an aftermarket intake, custom piping, or need a versatile clamp-on option for hobby projects, the RE-0870 offers a robust, serviceable solution that fits many setups.

FAQ

Q: Will this filter fit my 3.5-inch intake pipe?

A: No — the RE-0870 has a 4.00-inch flange. Use a reducer or select a filter matching your pipe diameter.

Q: How often should I clean the K&N RE-0870?

A: Under normal highway driving, clean roughly every 75,000 miles or sooner in dusty conditions.