Air and Fuel› Intake Manifolds and Components

Motordyne

Iso Thermal Plenum Spacer

$331.50

SKU: MD-516"IZ

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The Motordyne MD-516"IZ is a 5/16" Iso Thermal plenum spacer designed for the Nissan 350Z and compatible Infiniti models. It adds 12-14 horsepower by thermally isolating the upper and lower plenum, reducing heat soak. This spacer is compatible with your engine cover and strut bar.
Show original supplier description
The Motordyne 5/16" Iso Thermal plenum spacer is engineered to enhance performance for the Nissan 350Z and compatible Infiniti vehicles (G35, M35, FX35) with the VQ35DE engine. This component is designed to provide a power increase of 12-14 horsepower by effectively thermally isolating the upper and lower intake plenums. This isolation combats heat soak, a common issue that can rob an engine of its power, especially under demanding conditions. The 5/16-inch thickness of this spacer is optimized to deliver the best balance of performance gains while remaining fully compatible with your existing engine cover and strut bar, ensuring a clean installation without compromising other components. Each kit includes all necessary hardware for a complete installation, simplifying the process for the end-user. Please note that due to CARB regulations, this item cannot be sold or shipped to California, regardless of the vehicle's intended use. International shipping is also not available.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandMotordyne
Part NumberMD-516"IZ
CategoryAir and Fuel

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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