ISR Performance Tubular Bottom Mount Turbo Manifold - Nissan SR20DET - Version 3 SCH10

The ISR Performance Tubular Bottom Mount Turbo Manifold Version 3 is the third-generation tubular bottom-mount manifold for the Nissan SR20DET, built from thicker Schedule 10 weld-el piping for better durability and crack resistance than typical OEM-style cast or thin-wall tubular replacements. Designed for builds chasing more power than the factory cast manifold can support while keeping bottom-mount turbo packaging.

What It Does

The factory SR20DET cast iron manifold cracks. That's not a maybe, that's the reality on any SR that's seen real boost or heat cycles, especially the S13 Redtop and S14 Notchtop manifolds. The V3 tubular replacement uses Schedule 10 weld-el pipe sections, which is thicker than most aftermarket tubular manifolds on the market. Thicker wall thickness means better resistance to thermal cracking, longer service life under heat cycling, and the confidence to make real power without watching for cracks.

This is the upgrade over the ISR V2 manifold, with the V3 stepping up to Schedule 10 piping for serious builds. Bottom-mount design retains factory turbo positioning, which keeps things simple if you're using the stock T25/T28 turbo or a direct bolt-on upgrade.

Installation Note

On some T25 or T28 stock turbos, you may need to clock the turbo slightly to clear the larger runners on this manifold. Plan for this during install. Not difficult, but it's a step that catches people off guard.

Fitment

• Nissan SR20DET S13 (Redtop)
• Nissan SR20DET S14 (Notchtop and Blacktop)

What's in the Box

• 1x ISR Performance V3 SCH10 tubular bottom-mount turbo manifold

Product Details

Brand: ISR Performance

Part Number: IS-SSH-NS13-V3

Type: Tubular Bottom Mount Turbo Manifold

Version: V3 (upgrade over V2 with thicker Schedule 10 piping)

Engine Fitment: Nissan SR20DET (S13/S14)

Construction: Tubular, Schedule 10 weld-el piping

Turbo Mounting: Bottom mount, factory T25/T28 flange

Installation Note: May require minor turbo clocking on stock T25/T28 to clear larger runners

Replaces: Factory cast iron SR20DET manifold (known crack point)

Application: Built and boosted SR20DET street, track, and drift builds

Sold: Individually

Legality: Off-road and competition use only