K&N 57-9018 Engine Cold Air Intake Performance Kit

Performance Intake Overview

The K&N 57-9018 cold air intake system is built for drivers who want improved airflow and a direct-fit performance upgrade. It uses a high-density polyethylene intake tube, a washable oiled cotton filter, and a heat shield to help isolate incoming air from engine-bay heat.

Key Features

• High-density polyethylene intake tube for smoother airflow
• Washable, reusable oiled cotton gauze filter
• Oversized conical filter design for extended service intervals under normal highway driving
• Custom heat shield helps separate intake air from engine-bay heat
• CARB EO D-269-31 and street legal in all U.S. states
• Part number 57-9018

Detailed Description

This K&N 57-9018 performance air intake system is engineered as a Gen II 57 Series FIPK setup with a black HDPE intake pipe, stainless steel clamps, and a pre-oiled red cotton gauze filter. The design is intended to increase airflow volume and support measurable horsepower and torque gains, while the included heat shield helps maintain cooler intake air. For Lexus IS300 owners, this intake provides a fitment-specific upgrade that aligns with the vehicle’s factory intake layout.

The 57-9018 also includes the intake tube ports needed for the specified application, and the mass air flow sensor adapter is included when required. K&N’s replacement filter for this system is RP-4980, and the filter is washable for repeated service. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Restricted factory intake airflow
• Heat soak from the engine bay
• Loss of throttle response caused by a less efficient intake path
• Frequent disposable filter replacement
• Need for a CARB-exempt intake on approved applications

Installation Notes and Tips

Fits 2001-2005 Lexus IS300, N/A. Verify CARB status for your exact application before purchase, since emissions legality can vary by vehicle configuration. The system is designed for a direct-fit installation and is typically installed in less than 90 minutes.

Quality Assurance

K&N backs this intake with a 1,000,000-mile/10-year warranty. The system uses a washable, reusable filter and a CARB EO number listed for approved applications, supporting long-term serviceability and compliance where applicable.