ISR 4-2-1 Tubular Header for Nissan 240SX KA24DE 1991–1998 | 3” Flange

Unlock better exhaust flow, improved throttle response, and stronger mid-range power with the ISR Performance 4-2-1 Tubular Header for the Nissan 240SX KA24DE engine. Designed as a direct bolt-on replacement, this header features mandrel-bent stainless steel tubing and a 3-inch collector flange, allowing easy fitment with your factory catalytic converter or any aftermarket test pipe and exhaust system.

Whether you’re building a track car or upgrading a street machine (for off-road use), this header offers a noticeable improvement in flow efficiency and performance with a solid, durable design.

Key Features

• High-quality stainless steel construction for strength and corrosion resistance

• 4-2-1 tubing layout enhances mid-range torque and throttle response

• Expanded 3” outlet flange for direct bolt-on to factory or aftermarket exhaust setups

• Integrated gusset plate improves durability by reinforcing primary tubes

• Includes exhaust gaskets and hardware for easy installation

What’s Included

• 1x ISR 4-2-1 tubular header

• 1x exhaust manifold gasket

• 1x 2-bolt 3” gasket

• Mounting hardware

Vehicle Fitment

• 1991–1998 Nissan 240SX (LE)

• 1989–1998 Nissan 240SX (SE, Base)

• 1989–1990 Nissan 240SX (XE)

Note: For KA24DE engine only. Not compatible with KA24E.

Legal Notice: For competition and off-road vehicles only. Not legal for use on public streets or highways.