DNA Air Box Cover Stage 2 for KTM Duke 125/250/390 Series/ Husqvarna (2020-25)

DNA Air Box Cover Stage 2 for KTM Duke 125/250/390 Series/ Husqvarna (2020-25)

The DNA Air Box Cover Stage 2 for KTM Duke 125/250/390 Series/ Husqvarna (2020-25) is designed to replace part of the air box and increase airflow to the engine. This Stage 2 application works exclusively with the DNA stock replacement air filter.

When combined with the DNA Stage 1 Air Filter, the Stage 2 setup delivers a 95.99% increase in airflow over the KTM/Husqvarna stock application. It also provides 98-99% filtering efficiency according to ISO 5011. Visit our website for more products Dirt Street. 

Related Bike Models

• KTM Adventure 390
• Husqvarna Svartpilen
• Husqvarna Vitpilen
• KTM Duke 125 (2017-)
• KTM Duke 250 (2017-)

DNA Advanced FCd Design

This Stage 2 Air Box Cover features DNA’s advanced FCd (Full Contour design). DNA designed it to work with the DNA stock replacement air filter as part of the Stage 2 application.

When correctly used with the DNA Stage 1 Air Filter P-KT3N18-0R, the setup increases the stated airflow, torque and power of the engine.

Stage 2 Airflow Performance

The DNA Stage 2 Air Filter P-KT3N20-S2 works with the DNA Stage 1 Air Filter P-KT3N18-0R to provide the stated airflow increase.

The combined DNA S1 and S2 setup produces 73.30 CFM. In comparison, the KTM/Husqvarna stock air box with the stock paper filter produces 37.40 CFM.

Therefore, the supplied data shows a 95.99% increase in airflow over the KTM/Husqvarna stock application.

The airflow measurements are:

• DNA S1 + S2 Airflow: 73.30 CFM
• KTM/Husqvarna Stock Airflow: 37.40 CFM
• Increase in Airflow: 95.99%
• Filtering Efficiency: 98-99%
• Measurement: @1.5″ H2O corrected at 25°C

Filtering Efficiency

The Stage 2 assembly achieves 98-99% filtering efficiency when used with the DNA Stage 1 Air Filter. DNA provides this filtering figure according to the ISO 5011 standard.

The Stage 2 setup therefore combines the specified airflow increase with the stated filtering efficiency.

Installation and Fuel Recalibration

DNA provides installation information with the Stage 2 Air Filter. The product works with the DNA Stage 1 Air Filter as part of the specified Stage 2 application.

Fuel injection recalibration is suggested but not necessary. However, the supplied product information also states that fuel recalibration is suggested for this application.

Road, Off Road & Race Use

This DNA Stage 2 Air Filter is designed for Road, Off Road & Race use. The application uses the DNA Stage 2 Air Box Cover together with the DNA Stage 1 Air Filter.

The box includes the cover, while the OEM air box cover reference is 93006002000.

Air Flow Data

The supplied airflow data shows:

• DNA S1 & S2 airflow: 73.30 CFM
• KTM/Husqvarna stock airflow: 37.40 CFM
• Increase in airflow: 95.99%
• Filtering efficiency: 98-99%
• Stage application: Stage 2
• Filter use: Road, Off Road & Race
• Filter design: DNA’s Advanced FCd
• Box includes: Cover