Skip to product information
Usually ships in 2–4 business days.
Aluminum Air Box Intake Without Lid For Honda TRX400EX TRX400X 400X ATV 99 To 07
$350.29
Sale price
$350.29
Regular price
Available to Order
This Aluminum Air Box Intake is an aftermarket air box assembly (without lid) compatible with Honda TRX400EX, TRX400X, and 400X ATVs from 1999 to 2007.
Need help finding the right part? Talk with a parts expert today.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Product Overview
This aluminum air box intake replaces the restrictive stock air box and lid on Honda TRX400EX and 400X models. It delivers increased airflow for improved throttle response and engine performance. Designed for riders seeking a simple, high-flow intake upgrade for their ATV.
Key Features & Performance
- Made from lightweight 6061 aluminum for corrosion resistance
- Open design eliminates the restrictive stock lid for maximum airflow
- Direct bolt-on fitment without major modifications
- Includes pre-installed foam filter retaining ring
- Improves air intake volume for better engine breathing
- Compatible with aftermarket carburetors and jetting kits
Fitment & Compatibility
- Honda TRX400EX (1999-2007)
- Honda TRX400X (1999-2007)
- Honda 400X (1999-2007)
Common Uses
- Trail riding and dune racing
- Performance rebuilding and engine upgrades
- Adding aftermarket exhaust and carburetor systems
- Restoring airflow on high-mileage ATVs
- Off-road competitions and recreational riding
Technical Specifications
- Material: 6061 Aluminum
- Design: Open intake without lid
- Fitment: 1999-2007 Honda TRX400EX/TRX400X
Frequently Asked Questions
Q: Will this air box intake require rejetting the carburetor? A: It is recommended to rejet the carburetor after installation to avoid a lean condition; consult a jetting guide based on your elevation and mods.
Q: Does the kit include an air filter? A: This air box comes with a foam filter retaining ring, but you will need to purchase a compatible air filter separately if not already equipped.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.