ISR Performance RamHorn Top Mount Manifold MVS SCH10 - Nissan KA24DE S13/S14

The ISR Performance RamHorn Top Mount Turbo Manifold is a Schedule 10 tubular top-mount manifold for the Nissan KA24DE (the naturally aspirated KA, turbocharged for a KA-T build) in S13 and S14 chassis. T3 turbocharger flange, 38mm MVS V-band wastegate flange, and the same heavy-duty Schedule 10 weld-el construction as the SR20DET RamHorn manifold. Designed to retain A/C and power steering on the KA24DE, tested with up to a 35-series turbo without fitment issues.

What It Does

The KA24DE is a popular boost target on 240SX builds for owners who don't want to swap to an SR20DET. Turbocharging the KA requires a turbo manifold, and finding a quality KA-T top-mount that fits a turbo big enough to make real power AND retains street accessories has historically been a problem. This manifold solves both: Schedule 10 weld-el piping for serious durability, T3 flange for popular turbo options, 38mm MVS V-band external wastegate flange, and a geometry that clears A/C and power steering on the S13/S14.

Tested with up to a 35-frame turbo (Garrett G35, RSX3582, etc.) without fitment issues, so you can go from mild boost setups all the way up to serious high-horsepower builds on the same manifold.

Critical Spec

• T3 turbocharger flange
• 38mm MVS V-band external wastegate flange
• Schedule 10 weld-el piping
• A/C and power steering compatible
• Tested up to 35-frame turbo

Manifold-to-Head Gasket Not Included

You'll need a manifold-to-head gasket separately. ISR recommends the multi-layer KA24DE exhaust manifold gasket (part #IS-EMG-KA247) for this manifold.

Recommended Companion Parts for a Complete KA-T Top Mount Build

• Manifold-to-head gasket: IS-EMG-KA247 (multi-layer)
• Turbocharger: ISR RSX3076 (dual ball bearing T3) or ISR RSX3582 (dual ball bearing T3)
• O2 housing / turbine outlet: IS-O2-KATM
• Downpipe: IS-SSDP-NKAT
• Top-mount turbo line kit: Nissan 240SX KA24DE RWD Turbo Line Kit (Top Mount)
• Oil drain flange: ISR GT Series oil drain flange (or version with integrated -10AN)
• Oil restrictor (required for ball bearing turbos): IS-OR-3036
• Top-mount intercooler piping: ISR Hot Side Top Mount IC Piping Kit (works with standard S-Chassis ISR intercooler kits)

Fitment

• 1989-1994 Nissan 240SX (S13) with KA24DE (turbocharged build)
• 1995-1998 Nissan 240SX (S14) with KA24DE (turbocharged build)

What's in the Box

• 1x ISR Performance KA24DE RamHorn top-mount turbo manifold, Schedule 10

Product Details

Brand: ISR Performance

Part Number: IS-SSHT-NKAT

Type: Tubular Top Mount Turbo Manifold (RamHorn)

Engine Fitment: Nissan KA24DE (KA-T turbocharged builds)

Chassis Fitment: S13 and S14 240SX

Construction: Tubular, Schedule 10 weld-el piping

Turbocharger Flange: T3

Wastegate Flange: 38mm MVS V-band (external wastegate required)

Max Tested Turbo Frame: 35-frame (G35 / RSX3582 / similar)

A/C Compatible: Yes

Power Steering Compatible: Yes

Manifold-to-Head Gasket: Not included (recommend IS-EMG-KA247)

Application: Top-mount KA-T builds chasing real power while retaining street accessories

Sold: Individually (manifold only)

Legality: Off-road and competition use only