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Toyota 2JZ Intake Manifold Guide

Chandler Stark

Meet Chandler

Chandler is an automotive expert with over a decade of experience working on and modifying cars. A couple of his favorites were his heavily modded 2016 Subaru WRX and his current 2020 VW Golf GTI. He’s also a big fan of American Muscle and automotive history. Chandler’s passion and knowledge of the automotive industry help him deliver high-quality, insightful content to TuningPro readers.

The Supra intake manifold is more than suitable for stock power levels and average builds, but for those wanting more than 600 whp an aftermarket intake manifold can really help with top-end power. That’s why one of the best 2JZ upgrades is to the intake manifold. You will gain horsepower while shedding weight and improving efficiency.

This guide will cover everything you need to know about upgrading your 2JZ intake manifold. We’ll cover what intake manifolds are, before exploring differences between aftermarket and OEM, and then we’ll cover benefits to upgrading. Finally, we’ll give you recommendations of the top 2JZ intake manifolds on the market to choose from. Let’s get started.

*This guide applies to the twin-turbo 2JZ-GTE engine. However, it is possible for the naturally aspirated 2JZ-GE engine to be modified to take the 2JZ-GTE front facing intake manifold (FFIM). The FFIM mod is outside the scope of this article, but it is possible to use 2JZ-GTE intake manifolds on the 2JZ-GE engine with the FFIM.

Best 2JZ Intake Manifold Upgrades - Hypertune Supra Manifold

Table of Contents

OEM vs Aftermarket

There are important differences between the stock 2JZ intake manifold and aftermarket versions. The most obvious is going to be the size of the intake runners and plenum. Aftermarket Supra intake manifolds are going to have wider runners to increase flow and decrease restriction. They will also have larger and better-flowing plenums.

The wider intake runners will allow for more air to pass through the manifold and into the engine. The better flowing plenum accommodates the shorter but wider runners, while also allowing for proper pulse-reversion control.

Pulse-reversion control, without getting too technical, is a phenomenon of any intake manifold. Basically, when the butterfly valves inside of the intake manifold close, like when a driver lays off the gas pedal, the air inside of the runners is forced back up into the plenum. Properly designed plenums minimize turbulence and allow for smooth reversion of the exhaust pulses back into the runners once the valves reopen. Poorly designed plenums exacerbate turbulence and impede flow.

Aftermarket intakes are also usually made of lighter material than stock versions. Stock 2JZ manifolds are built from heavy cast iron, but most aftermarket manifolds are made from aluminum. Aluminum manifolds are lighter and flow better, making them an obvious choice over cast iron.

When to Upgrade From the Stock Supra Intake Manifold

The time to upgrade from the stock intake manifold is somewhat debatable. Generally, it’s accepted that the stock intake manifold flows well enough to achieve 1,000 whp. However, that doesn’t mean that you have to have a 1,000+ whp build to benefit from an upgraded manifold.

You probably won’t see much of a benefit at power levels below 600 whp, but from 600 whp – 1,000 whp you will see substantial power increases with an aftermarket manifold. The improved flow and pulse reversion will increase peak power and improve the power band.

It’s important to note that wider and shorter intake runners, like those on many aftermarket 2JZ intake manifolds, have a tendency to push peak torque to higher RPMs. This increases top-end power and the expense of low-end power, and might actually make for a slightly smaller power band. Still, the increase in top-end power is usually worth it, even if you lose some grunt down low.

Overall, you don’t need to upgrade your intake manifold unless you plan on going past 1,000 whp. However, if you do decide to, builds from 600 whp to 1,000 whp will still benefit. We’ll get into how much you can expect to gain a little later, but it’s roughly 40 whp – 70 whp.

Upgrading the Toyota Supra Throttle Body

Most Supra intake manifold kits come with larger throttle bodies than stock to accommodate the larger plenum. The stock throttle slims down from 71mm in the front to 65mm where it attaches to the stock manifold. Similar to the intake manifold, the stock throttle body flows surprisingly well and is capable of 1,000 whp.

However, the larger size of aftermarket intake manifold plenums creates a compelling reason to also upgrade the throttle body. To truly take advantage of all the benefits of the new manifold, a throttle body that is specifically sized for it is necessary. The smaller stock throttle body will still flow adequately, but it will be less than with a larger throttle body. If you are really looking to get the most of your upgraded 2JZ intake manifold, it doesn’t make sense to leave the stock throttle body in place. It might flow well enough to not be a restriction, but a better flowing throttle body will still make more power.

6 VS 12 Injector Manifolds

There are generally two kinds of 2JZ intake manifolds. Standard intake manifolds are designed for six injectors, but there are also big port manifolds for 12 injector setups. The 2JZ-GTE in its stock form has six injectors, but really big horsepower builds add supplemental injectors for extra fueling. The manifolds look almost identical, with the difference being an extra bung for the supplemental injectors on each runner, and slightly wider runners.

2JZ Intake Manifold Benefits

  • +20-80 whp (depending on build level)
  • Decreased intake restriction and improved flow
  • Weight Reduction
  • Louder exhaust volume

The biggest benefit to upgrading the 2JZ intake manifold is going to be the power increases. On smaller builds, you can see gains of 20-30 whp. Larger builds, those above 700 whp, can add 40-80 whp with an upgraded and better-flowing manifold. The increase is going to be more on the top end than on the low end, but the majority of the powerband will see increases. It’s impossible to give precise numbers for gains, because every setup is different, but these are averages from Supra builds.

Another benefit of an upgraded 2JZ intake manifold is weight reduction. The lighter aluminum or cast aluminum sheds crucial weight over the heavy cast iron version. Aluminum manifolds also usually outflow cast iron manifolds, meaning more power.

Finally, you will likely see an increase in exhaust volume following the installation of a larger intake manifold. It won’t be drastic, like installing a cat back, but the volume will definitely be louder.

Veilside Intake Manifolds

If you have spent any time talking to the Supra community about intake manifolds, you have undoubtedly heard of the Veilside intake manifold. The Veilside was one of the most popular 2JZ intake manifolds in the 1990s and early-2000s. While it wasn’t great for low end performance and spool, it made huge top-end power.

Unfortunately, the 2JZ Veilside intake manifold has not been manufactured since the late-’90s-early-’00s. There are some genuine and rare ones still available in the wild, but they aren’t an easy find. Many companies produced knockoff “Veilside style” intake manifolds using supposedly similar dimensions, but they do not perform nearly as well. If you can find one available then it will also likely be pretty pricey – and used.

While the 2JZ Veilsides were certainly solid performers, there’s no reason to go to extraordinary lengths to seek them out. In addition, the “Veilside style” manifolds are cheap clones that should probably be avoided too for the most part. All the 2JZ intake manifolds listed below perform exceptionally, are better than knockoffs, and won’t carry a crazy price tag.

5 Best 2JZ Intake Manifolds

2JZ intake manifold from Sleeper Designs
Sleeper Designs
  • Hypertune
  • Sleeper Designs
  • Virtual Works
  • Sound Performance
  • Ross Machine Racing

These intake manifolds combine the best in price, performance, quality, and aesthetics. While there are literally dozens of different manifolds available, these are the top options if you’re looking to upgrade. We included both standard and big or race port manifolds in the guide, for the broadest selection possible.

Intake Manifold Upgrades Are Crucial For High Horsepower 2JZ-GTE Builds

The 2JZ engine is one of the most legendary motors ever created, and if you really want to make some serious horsepower out of it then intake manifolds are a great mod. You’ll see a considerable improvement to horsepower and torque output, while also making your engine more aesthetically pleasing and lighter.

We looked at a couple of different 2JZ intake manifolds in this guide, and they are all very solid. The Hypertune and RMR manifolds have been on the market the longest and are tried and true options. The Sleeper Designs, Virtual Works, and Sound Performance manifolds are also solid performers that have great reputations in the Supra community. You really can’t go wrong with any of these manifolds, as they are all top options and performers.

What intake manifold are you thinking about picking for your build and what goals are you looking to achieve? Let us know in the comments below!

 

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