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VQ30DE Intake Manifold Spacer Kit Review

During those HOT summers, don't you wish there was a solution to the decline in response and performance once that dreaded heat soak process has taken effect? Heat Soak occurs when heat is applied and not dissipated at an equal rate causing the material to flood with overwhelming tempature limits. That being said Aaron Kimball of NWP Engineering has thought of an easy solution to keep those intake temperatures at optimal levels. The use of Phenolic Laminate Material insulates the intake and throttle body components, reducing the rate of heat transfer from the heads to the intake manifolds, for cooler air which in turn restores optimal performance. Phenolic Laminates are usually compression molded and they have good strength and toughness, good arc resistance and other electrical properties, good resistance to solvents and high temperatures which makes this Spacer Kit a bargain. Today's product we are going to focus on is the VQ30DE Phenolic Thermal Intake Manifold Spacer Kit which is said to have an average Intake Manifold Temperature decrease of 43degrees.

Basing our review from a factory VQ30DE Intake manifold, there is a noticeable increase in throttle response and midrange RPM potentialm on our Project Maxima. Not only was the installation straight forward it fit extremely well for a one man installation. We will also note that once this product is installed the RTV should be allowed 1hour to fully cure before vigurous driving can occur.


Detailed Installation Manual Supplied.
Excellent Packaging/Labelling
Great fit and finish.
Superb Customer Service


None so far.


  • 1995-99 Nissan Maxima
  • 1996-99 Infiniti I30

Additional Note:

  • There is an optional Six Step Drill Bit for ease of EGR tube bolt enlarging
  • These spacers are designed to be installed without using any OEM gaskets. RTV silicone sealant is to be applied to both sides of every spacer to prevent intake leaks on all mating surfaces. If your engine is force inducted above 6psi of manifold pressure, the use of Permatex 1 Minute Gasket (Item #25229) instead of Black RTV is recommended.
Part Number Information:


  • 1995-99 Phenolic Thermal Intake Manifold Spacer Kit
  • w/ Optional Six Step Drill Bit
  • $225

Where To Purchase:


Tools Required for Installation:


  • Basic Metric Socket set
  • Basic Metric Open-Ended Wrench set
  • Pliers
  • Flathead and Phillips Screwdriver
  • Torque Wrench
  • Permatex Ultra Black RTV Silicone Gasket Maker (598B) or 1 Minute Gasket (25229)
  • Hand Held Drill
  • 7/16”-1/2” Drill Bit or included Step Drill Bit (optional)
  • 5/16” Fuel Injection Hose (optional)

Parts Included:


  • TWO 1/16" High Quality CNC Machined Phenolic Intake Manifold Spacers (Lower Intake Manifold)
  • 1/4" High Quality CNC Machined Phenolic Intake Manifold Collector Spacer (Upper Intake Manifold)
  • 1/4" High Quality CNC Machined Phenolic Throttle Body Spacer (Throttle Body)
  • Intake Manifold Collector Coolant Bypass Fitting
  • 4 Lengthened Zinc Plated Grade 8 Throttle Body bolts and washers
  • 2 High Temperature Nylon Cable Ties
  • Titanium Nitride Coated 3/16"-1/2" Six Step Drill Bit (optional Add $10)
  • Printed Detailed Installation Instructions with Photos (PDF Instructions)
  • Two Die Cut Silver Vinyl NWP Engineering Decals

    Dissassembly Process: Upper Intake Manifold


    Start off by relieving fuel pressure simply by removing the gas cap, pulling the fuel pump fuse under the dash and attempt 3 cranks of the motor. Disconnect the Negative battery cable and proceed to remove intake plumbing connected to the throttle body making sure to disconnect the MAF sensor, Temperature sensor, and various vacuum lines. Disconnect the TPS located on the side of the Throttle body and proceed to disconnect the various electrical connections to the IACV, coilpacks, solenoids, and numerous vacuum lines. Now that you have completely disconnected all electrical connections you can now move the wiring harness out of the way toward the passenger side of the engine bay.

    Remove the three rear coil packs (2-8mm bolts each) and place them in a safe place making sure not to drop them. Remove the two(2) throttle body cables from the assembly and their supporting bracket and lay that over to the passenger side for now. To remove the IACV from the Upper manifold you must first undo the 10mm bolt holding the EGR temp sensor bracket and then the IACV assembly bolts. While out of the vehicle you can clean up the port with Throttle cleaner for a smoother idle. Uninstall the Throttle body by removing the 4-12mm bolts, disconnecting the TPS connections, and finally when removed scrape the paper gasket off of the upper manifold.

    To fully remove the Upper manifold locate the 2-12mm EGR tube bolts near the now removed IACV assembly and also the 2-12mm manifold support bracket bolts near the center of the upper manifold nearest the firewall. The manifold has 2 bolts and 2 nuts at the front most portion of the assembly, remove these and the manifold should lift but will not come out just yet. Lift the manifold as much as you can and you will be faced with two coolant hoses from the backside near the upper EGR tube. Keep these upright once removed to prevent coolant from leaking. You may now remove the upper intake manifold from the vehicle. Be sure to COMPLETELY cover the manifold ports while working in the engine bay.

    Interim Modification Process: Coolant Bypass, EGR Tube modification

    Now that you have successfully removed the Upper Manifold it is time to do some pre-reassembly steps. Merge the two coolant tubes previously routed through the upper manifold using the supplied brass fitting. To avoid heat damage NWP supplied two (2) high temperature zipties to secure the bypass tube to the heater hoses near the firewall. Enlarge the upper EGR bolt holes using the optional 7/16" Step bit tool to allow for clearance once the spacers are installed.


    Dissassembly Process: Lower Intake Manifold

    Start by disconnecting the 6 injector clips from their designated injectors. Remove the 2 grounding bolts from the front most portion of the lower as well as the breather hose connecting the two valve covers. Remove the 4 lower manifold bolts and 4 nuts and you have succesfully allowed the lower manifold to be lifted and tilted out of the way to work on the lower manifold spacers. Be sure to COMPLETELY cover the manifold ports while working in the engine bay.


    Reinstallation Process: Lower, Upper, and Throttle Body Spacers installation

    Before installing the new spacer, carefully wipe the lower port surfaces clean of oil and debris once the OE gaskets have been removed. Perform a dry install of the gaskets to determine best fitment before applying the RTV on both sides of the new spacer pieces. Be sure to apply sufficient RTV sealant to keep vacuum leaks from occuring while also avoiding intake air obstruction from excessive application. Press firmly on the spacers to ensure a seal on the heads before careful seating the lower manifold making sure the spacers do not misplace themselves. Reinstall the lower manifold connecting the 6 corresponding injector clips. Perform a dry install of the upper manifold gasket to determine best fitment before applying the RTV on both sides of the new spacer. Apply the RTV and firmly press the spacer to the lower manifold to ensure a seal before reinstalling the upper manifold and corresponding vacuum lines. Reinstall the upper manifold in reverse order while making sure to secure the newly enlarged EGR bolt holes. Tighten up all loose ends including adjusting throttle cables to fully the closed position. Install the throttle body spacer in the same method as that of the upper and lower pieces and bolt everything back together using the supplied extension bolts. Allow the RTV to dry for 1hour before starting the vehicle and enjoy cooler intake temperatures.


    Finished Product: Spacer Kit Installed
    Parts Review