Initiate Motorsports 5/16” Thermal Composite Plenum Spacer – VQ35DE & RevUp

Reduce heat soak and improve intake efficiency with the Initiate Motorsports 5/16” Thermal Composite Plenum Spacer, designed specifically for VQ35DE and VQ35DE RevUp engines found in the Nissan 350Z and Infiniti G35. This spacer is engineered to lower intake air temperatures and support consistent performance, especially on modified and aggressively driven cars.

Unlike metal plenum spacers that retain heat, our spacer is made from a high-strength thermal composite material that dissipates heat more effectively, helping keep intake air cooler and denser. Cooler air means more consistent power and improved throttle response.

Key Features & Benefits

• 5/16” plenum spacer for optimal airflow and heat reduction

• Thermal composite construction resists heat soak better than aluminum spacers

• Helps lower intake air temperatures (IATs)

• Improves throttle response and overall drivability

• Includes a high-quality upper plenum gasket that sandwiches the upper plenum to the spacer. Cheap aftermarket brands do not include this gasket

• Designed to outperform common cheap Chinese aftermarket spacers that do not include proper gaskets

• Direct bolt-on for all VQ35DE and RevUp engines

Fitment

• 2003–2006 Nissan 350Z (VQ35DE)

• 2006–2007 Nissan 350Z (VQ35DE RevUp)

• 2003–2006 Infiniti G35

• 2007 Infiniti G35 (DE models)

Installation & Tuning

No tune is required for installation, making this an easy and effective bolt-on upgrade. However, tuning is highly recommended to maximize the benefits, especially when paired with other airflow modifications.

This Initiate Motorsports thermal composite plenum spacer pairs perfectly with our ported upper and lower plenums, making it an ideal upgrade for anyone looking to improve airflow, reduce heat soak, and build a more efficient VQ35DE intake system.