ISR Performance Tubular 4-2-1 Header - Nissan 240sx KA24DE 91-98

The ISR Performance 4-2-1 Tubular Header for the KA24DE 240SX is a solid stainless steel header with an expanded 3" outlet flange for clean bolt-on to a stock exhaust system. 4-2-1 design steps the four primary runners into two collectors, then into one for better mid-range torque, which is where the KA24DE actually does its work.

What It Does

The factory KA24DE manifold is a flow restriction. A 4-2-1 header opens up the exhaust path, reduces back-pressure that would otherwise rob the motor of power, and tunes the primary collector geometry for a torque-friendly powerband. Solid stainless steel construction and professional welds mean it'll outlast multiple build cycles. The 3" outlet flange matches most 3" aftermarket catbacks for a straightforward install.

Fitment

Designed for the Nissan 240SX 1991-1998 (S13 late and S14) with the factory KA24DE engine. Will not fit KA24E single-cam (1989-1990).

What's in the Box

• 1x 4-2-1 tubular header
• 1x header-to-head manifold gasket
• 1x 2-bolt outlet gasket

Product Details

Brand: ISR Performance

Part Number: IS-SSHD-240KA

Type: Tubular header (4-2-1 design)

Vehicle Fitment: Nissan 240SX 1991-1998 (KA24DE only, will not fit KA24E)

Material: Solid stainless steel

Outlet Flange: 3" (bolt-on compatible with stock and aftermarket 3" exhausts)

Companion Gasket: IS-EMG-KA247 (7-layer steel manifold gasket, if replacing later)

Sold: Individually (with manifold and outlet gaskets)

Legality: Off-road and competition use only