VQ G35 Plenum Spacer HP Gain, is it worth it?

February 23, 2021

SHORT and SWEET

VQ35 PLENUM SPACER, is it WORTH IT?

First of all, what is a Plenum Spacer?

What is a Plenum?

What is a Spacer?

What is Space?

The questions go on...

The PLENUM is the fancy word for VQ35 Intake Manifold. Mainly because the Intake Manifold is made up of a few different pieces, rather than one large cast or welded unit. The Plenum is what collects the air after flowing through the throttle body, immediately before entering your engine. The Plenum Spacer is designed to be installed between the upper 2-piece section of the Plenum. This increases the size of the Intake Manifold. Ultimately increasing the volume of the Intake Manifold.

In simple terms MORE AIR MORE POWER.

Is the plenum spacer worth it?

The short answer is yes..

The VQ is begging for some added flow. The BLOX GEN2 HYPERTEMP PLENUM SPACER can add up to 10HP+. Feed your engine more air and let it breathe.

Combine this plenum spacer with an intake, downpipes, and exhaust, you will instantly feel the difference in power throughout the entire powerband. Not to mention the sound of a well-tuned intake is better music than whatever top 40 is playing anyways.

Fig 1. Shows a good example of a VQ35DE Upper Plenum

The new Plenum Spacer would be installed in place of marked “GASKET”

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Here is a thread that had some useful information

https://g35driver.com/forums/intake-exhaust/324918-oem-plenum-intake-manifold-bolt-sizes-vq35de-2.html

And,

Here is the sequence suggested for upper plenum removal.

sequence for upper plenum removal diagram

Bolts 1, 3, 6, & 9 = M6 x 1 x 60mm (red)
Bolts 2, 4, & 5 = M6 x 1 x 45mm (yellow)
Bolts 7, 8, 10, 11, 13 - 16, & 18 = M6 x 1 x 25mm (green)
Nuts 12 & 17 = M6 (green; these nuts & studs are sometimes replaced with M6 x 1 x 25mm bolts in aftermarket applications)