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STILLEN Z-Tube Intake Kit

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based on 5 Reviews

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Z-Tube for Infiniti G35 and FX35

The factory intake tracts on the Infiniti G35 and FX35 were not designed for maximum performance. On the other hand, the 350Z, which shares its engine with these vehicles, is equipped with a much more efficient intake tube that breathes easier and cooler than its Infiniti counterparts. The OEM 350Z intake tract fits the G35 and FX35, as long as you're willing to pay the price for OEM parts. If you want more power for less money, the experts at STILLEN have got you covered with the STILLEN Z-Tube. It offers all the performance of the 350Z tube without the high OEM price tag.


Made of roto-molded plastic, the Z-TUBE intake tract offers excellent insulation properties, isolating inbound air from engine heat. The result: a colder intake charge and increased power. You can run the Z-TUBE with the stock airbox. For maximum gains, we recommend pairing it with the STILLEN Hi-Flow Intake, part #402835.


Due to the different states of factory tune of each stock model, the intake (independent of the Z-Tube) adds 11 horsepower at 6,100 RPM to the G35 Sedan and 5 ponies at 5,700 RPM to the Coupe. Comprised of a high-quality polyurethane intake port, washable and reusable cotton filter element, and STILLEN signature Aluminum Venturi Ring, the intake draws air from outside the engine bay.

The Venturi ring acts as a velocity stack, speeding up and directing the airflow into the intake chambers, producing a noticeable power bump. The Intake System also lends a more aggressive tone to the G35 and FX35 when pressed, but remains unobtrusive at cruising speed.


The Z-Tube / Intake Combo package is the affordable way to upgrade the entire intake tract, combining the Z-Tube (Part #402834) and Hi-Flow Intake (Part #402835) in one convenient part number.

Features & Benefits:

  • Includes connections for all factory breather tubes
  • Polyurethane heat shield isolates cold air from engine heat
  • Utilizes genuine K&N filter with 1 million mile warranty
  • Eliminates factory baffling, increasing flow efficiency
  • Z-Tube constructed of Roto-Molded Plastic
  • Increased Throttle Response, Adds 11HP Sedan, 5HP Coupe
  • Genuine K&N Air Filter w/ 1,000,000 Mile Warranty
  • Limited Lifetime Warranty

Additional Notes:

  • Re-uses factory couplers



About STILLEN Parts & Accessories

Steve Millen Sportparts, Inc. and STILLEN humbly started their race to the front of the pack in 1986. Starting with aftermarket mini-truck appearance packages, we quickly found ourselves fulfilling customer's requests to build products for other vehicles such as vans and full-sized trucks.

With that came performance parts, suspension pieces, and upgraded brake products such as big brake systems. Capitalizing on his racing career, and knowing what it took to make sports cars perform like no other, it was only natural for Steve Millen to branch out into the import car scene. Over two decades later, we offer a full array of products encompassing styling, performance, handling, and braking products for just about any car, truck, or SUV.


Z-Tube Intake Kit

  • Good

    by Glen
    I m very impressed I ordered it and got my product and have installed it, it sounded awesome under load and full throttle. I is nice under normal driving it's pretty normal. BTW I don t actually own a Infinti G35, I own a V35 Nissan Skyline with VQ25DD engine.
  • Great Value

    by Noah Sichanthavong
    Just finished installing this intake on my 2003 G35 Sedan and let me say it sounds great. The pitch is much lower and you can hear an awesome "hissing" at 3k rpm. The installation was fairly simple and i did it in ~30mins having 0 experience working on cars ( this is my first mod). I am extremely happy with this purchase.
  • Jonathon Murrill

    by Jonathon Murrill
    Installed on my 05 g35 coupe. Super easy to install and the difference is definitely noticeable. Very impressed. Tasteful yet mean. Two thumbs up!
  • Wesley Jones

    by Wesley Jones
    First of all, the great people at Stillen got my Hi-Flow Intake and Z-Tube to me super fast. The intake itself is amazing so far. My FX sounds more aggressive and I can definitely feel additional power. The only issue is that I had to go and buy 4 M6-1.0 x 20mm screws because the stock and provided screws did not work well. Overall, amazing product that is easy to install and has very noticeable gains in power and in sound.
  • Sam Rauseo

    by Sam Rauseo
    Installed the Hi-flow intake w/ Z tube on my '03 G35 coupe. Had it on about a week and absolutely love it. Looks great, throttle response is quicker and it sounds so mean! Great intake.

based on 5 Reviews

To write a review please select specific product