4-1 Exhaust Header Fit for 1990-1995 Nissan Hardbody D21 2.4L KA24E 4WD

Stainless steel 4-1 exhaust header designed for compatible 1990-1995 Nissan Hardbody D21 pickup trucks equipped with the 2.4L KA24E inline-4 engine and 4WD drivetrain. Featuring 1.50 in primary tubes, a 2.50 in outlet, 7/16 in cylinder-head flange, and 3/8 in outlet flange, this header is designed around the specified Nissan D21 4WD exhaust configuration. The tubular 4-1 layout provides a more direct exhaust path from the cylinder head to the collector while maintaining the dimensions required for the listed application.

Vehicle Fitment

• Fit for compatible 1990-1995 Nissan Hardbody D21 Pickup
• Engine Compatibility: 2.4L KA24E Inline-4
• Drivetrain Compatibility: 4WD / 4x4 ONLY
• Does Not Fit 2WD Nissan Hardbody D21 models
• Does Not Fit KA24DE engine applications
• Designed specifically around the listed Nissan Hardbody D21 2.4L 4WD configuration
• Please verify the exact vehicle year, model, engine code, drivetrain, cylinder-head configuration, and existing exhaust system before purchasing
• Vehicles with engine swaps, aftermarket cylinder heads, suspension modifications, custom motor mounts, or previous exhaust modifications may require additional fitment verification

Product Highlights

• D21 4WD-Specific Fitment – Designed for compatible 1990-1995 Nissan Hardbody D21 pickups equipped with the 2.4L KA24E engine and 4WD drivetrain
• 4-1 Header Design – Four primary tubes merge into a single collector for the specified exhaust configuration
• 1.50 in Primary Tubes – Features the specified 1.5 in primary tube diameter
• 2.50 in Outlet – Uses a 2.5 in collector outlet for connection to a compatible downstream exhaust system
• 7/16 in Head Flange – Thick cylinder-head flange provides a substantial mounting surface
• 3/8 in Outlet Flange – Collector outlet uses the specified 3/8 in flange thickness
• Stainless Steel Construction – Stainless steel construction provides durability for exhaust-system use
• Tubular Exhaust Layout – Designed to provide a smoother exhaust path compared with the compact factory-style cast manifold configuration
• 4WD Application Design – Intended specifically for D21 4WD models where front driveshaft and underbody clearance are important fitment considerations

Product Specifications

• Product Type: 4-1 Exhaust Header
• Vehicle Make: Nissan
• Vehicle Model: Hardbody D21 Pickup
• Vehicle Years: 1990-1995
• Engine Type: Inline-4
• Engine Compatibility: 2.4L KA24E
• Drivetrain: 4WD / 4x4 Only
• Material: Stainless Steel
• Header Configuration: 4-1
• Primary Tube Diameter: 1.50 in
• Outlet Diameter: 2.50 in
• Head Flange Thickness: 7/16 in
• Outlet Flange Thickness: 3/8 in

Package Includes

• 1 × Exhaust Header Assembly
• Installation Components as Shown

Installation Notes

• Please verify the exact vehicle year, model, engine code, and drivetrain before purchasing
• Designed for compatible 1990-1995 Nissan Hardbody D21 models with 2.4L KA24E engine and 4WD drivetrain
• Fits 4WD / 4x4 models ONLY
• Does not fit 2WD models
• Does not fit KA24DE engine applications
• Confirm cylinder-head flange alignment, front driveshaft clearance, steering-system clearance, transmission clearance, and downstream exhaust connection before installation
• Existing exhaust modifications, engine-mount wear, suspension-height changes, or previous underbody repairs may affect final clearance
• Keep O2 sensor wiring and nearby harnesses away from hot exhaust tubing and moving drivetrain components
• Start all mounting hardware before final tightening to allow proper header and downstream exhaust alignment
• Recheck mounting hardware and inspect for exhaust leaks after the first complete heat cycle
• Additional exhaust adjustment or fabrication may be required depending on the condition and configuration of the existing exhaust system
• Professional installation is recommended