Product Summary

The K&N RX-4140 X-Stream Clamp-On Air Filter is engineered for enthusiasts seeking increased airflow, engine protection, and reusability. Ideal for high-performance vehicles, it delivers up to 99% filtration efficiency with a unique top-pleat design and low-restriction airflow.

K&N RX-4140 Universal Air Filter – X-Stream Performance with Clamp-On Design

Built for performance enthusiasts, the K&N RX-4140 High-Flow Air Filter features an innovative pleated filter top that increases the surface area for enhanced airflow and superior filtration. With a washable and reusable design, it offers long-term value and peak engine performance.

High-Performance Filtration

• X-Stream Top Design – Increases surface area and airflow efficiency.

• Pleated Cotton Gauze – Multi-layered filter media designed for high dirt retention and optimized performance.

• Low Restriction – Promotes improved horsepower and acceleration.

Durable Build & Easy Fitment

• Clamp-On Installation – Simple and quick mounting without modifications.

• Centered Flange Type – Ensures a secure fit with minimal air turbulence.

• Washable & Reusable – Built to last with easy maintenance and re-oiling.

Technical Specifications

• Product Style: Round Straight Universal Air Filter

• Filter Line: High-Flow

• Air Filter Shape: Round

• Top Style: X-Stream

• Top Material: None

• Air Filter Material: Cotton Gauze

• Flange Inside Diameter: 3.531 in (90 mm)

• Flange Length: 0.719 in (18 mm)

• Flanges: 1

• Flange Type: Centered

• Height: 5.969 in (152 mm)

• Outside Diameter: 4 in (102 mm)

• Filter Re-oiling Amount: 0.5 oz (15 ml)

• Washable: Yes

• Warranty: 1-Year Limited

• Weight: 0.9 lb (0.4 kg)

• Overall Efficiency: Up to 99%

• Package Quantity: 1

• Package Contents: 1 Air Filter

• Box Dimensions: 7.25″ (H) × 4.63″ (L) × 4.63″ (W)

Added Benefits

• Cost-Effective Maintenance – Just clean, re-oil, and reuse.

• Long Service Life – Built to deliver reliable performance over many miles.

• Eco-Friendly Option – Reduces waste compared to disposable filters.

• FAQs

  Q1: Is the K&N RX-4140 filter washable?
  Yes, the RX-4140 air filter is fully washable and reusable for long-term use.

  Q2: What vehicles is this air filter compatible with?
  This is a universal air filter. Fitment depends on matching flange size and space availability in your intake system.

  Q3: Does it improve engine performance?
  Yes, it is designed to provide low restriction and improve horsepower and acceleration.

  Q4: What is the filter media used in this model?
  It uses multiple layers of high-quality cotton gauze for efficient filtration.

  Q5: How often should I clean and re-oil the filter?
  Cleaning frequency depends on driving conditions. Generally, clean every 50,000 miles under normal use or more frequently in dusty environments.