Why Upgrading Your SR20DET Exhaust Manifold Is a No-Brainer

The SR20DET is one of the most beloved turbo four-cylinders to ever come out of Japan—versatile, rev-happy, and begging to be modded. But if you're still running the stock SR20DET exhaust manifold, or a cheap off-brand one, you’re basically choking the engine every time you step on it.

Let’s talk facts: that manifold is holding you back. Badly.

Stock SR20DET Manifolds = Built for Compliance, Not Performance

Nissan nailed the core of the SR, but the factory manifold? That thing was designed to meet emissions, fitment, and cost standards—not to make power. Here’s what you’re dealing with:

Uneven runner lengths causing flow imbalance
Restrictive internal geometry that limits turbo efficiency
Prone to cracking under high heat and boost
Horrible for upgraded turbo setups

So if you’ve already added a bigger turbo, intake, or tune—but haven’t touched your SR20 manifold—you’re bottlenecking your build.

What a High-Performance Exhaust Manifold Does for the SR20DET

A proper turbo exhaust manifold for SR20DET completely transforms how the engine breathes and spools. Here's what you can expect when you upgrade:

Faster turbo spool and boost response
Higher flow efficiency, especially at mid-to-high RPMs
Better throttle response and drivability
More power with less strain on the engine
Stronger construction that can actually handle track heat and street abuse

Oh, and let’s not forget—it looks way better in the bay. (Because form still matters when the hood’s popped.)

Custom Fitment. Real Performance. Built in Lowell, MA.

At Select Speed Shop, we build and carry SR20DET exhaust manifolds designed for serious power and long-term reliability. Whether you're running a T25, T28, or a top-mount Garrett GTW, we’ve got the right fit—or we’ll fab it in-house.

We offer: