Free Shipping on Orders $99 and Up

Exclusions apply

42 Draft Designs Mk4 1.8T High Flow Intake System

42 Draft Designs
SKU
IN-04-001
$330.00

Please note that there is about a 1-2 week lead time when ordering 42 Draft Designs intakes.

Immediately following the release of the 42 Draft Designs TT 225 High-Flow Intake requests began pouring in for additional fitments. The VW Mk4 community seemed to shout the loudest, especially after learning that the TT intake is not a direct fit in the Mk4 1.8T. Although visually similar, the Mk4 1.8T intake required a complete re-design. Simply modifying the TT intake to fit the Mk4 was not an option. With the challenge well known and under a bit of pressure 42 Draft Designs set forth to tackle the fitment and create an intake that truly performs. Once again the finished product exceeds our expectations.

The 42 Draft Designs Mk4 1.8T High-Flow Intake System combines an oversized air filter with an engineered velocity stack in an accurately shaped heatshield. Precision machining, fabrication, and finishing methods are used throughout. The result is an air intake system that delivers serious gains and looks the part.

To understand how it works, let’s take a look at the construction. Starting at the MAF, an adaptor slides over the MAF while a silicone o-ring creates a seal. Our velocity stack slides through the heatshield and attaches to the MAF adaptor with an o-ring seal. The velocity stack represents the heart of the intake, drawing air equally from all sides and accelerating it to the opening of the MAF. An oversized air filter properly fits the velocity stack, minimally restricting airflow. The heatshield represents the backbone of the intake, holding the components together, mounting to the engine bay, and shielding the filter from engine bay temperatures.

The entire system assembles and installs with perfection thanks to the extensive craftsmanship used to create each component. The MAF adaptor and velocity stack are CNC machined from 6061 aluminum. O-ring grooves are utilized and contours follow the OEM MAF flange. The heatshield is constructed from waterjet cut 304 stainless steel. Each piece is fitted and TIG welded on precision tooling to assure accurate fitment. The heatshield is finished with a satin black powdercoat and stainless steel hardware is used to assemble the components.

Installed in the engine bay, the intake appears oversized and robust. On the road, it unleashes power and sound. The diverter valve is audible and the sound created by the velocity stack can only be described as vicious. Substantial power gains can be felt throughout the power band with no loss of low-end torque.

Construction:

  • CNC Machined 6061 Aluminum
  • CNC Waterjet Cut 304 Stainless Steel
  • TIG Welded Construction
  • Silicone O-Rings
  • 100% Stainless Steel Hardware
  • Satin Black Powdercoated Finish

Fitment:

  • Fits 1999-2005 VW Mk4 1.8T Golf/Jetta/GTI
  • Fits OEM & Aftermarket Turbo Inlet Pipes
  • Retains Factory SAI Plumbing
  • Reversible - No Modification Required


This High-Flow Intake System fits 1999-2005 VW Mk4 1.8T vehicles. It will fit OEM and aftermarket turbo inlet pipes. It includes all hardware necessary for installation. No modification to OEM parts is required - installation is completely reversible. Please note - this intake will NOT fit the Mk4 12v VR6, 24v VR6, or R32. It has not been tested on 2.0 or TDI models.

Includes:

  • Velocity Stack & MAF Adaptor
  • Heatshield
  • K&N Cone Filter
  • SAI Filter & Adaptor
  • Installation Hardware

How is it different than other intakes?

No Silicone.

Eliminating the use of silicone couplers was an important goal for this project. Although silicone couplers get the job done, 42 Draft Designs saw two major drawbacks and decided to avoid them. The first lies within the coupler itself. Smooth transitions are key to the function of a velocity stack and proper MAF readings. If the MAF is connected to the velocity stack with a silicone coupler, a series of edges inside the coupler create turbulence which can counteract the effect of the velocity stack. They found that a smooth, shallow transition from the velocity stack to the nose of the MAF produces the most power. The second drawback is all about appearance. Silicone couplers look messy, so they decided to machine a MAF adaptor that allows the MAF to slide into and bolt to our intake. The photos above show their CNC machined MAF adaptor and how they achieved our goal of no silicone.

6 Inch Aluminum Velocity Stack.

The purpose of this project was to develop an intake that delivered serious power gains. In order to achieve gains beyond a simple cone filter 42 Draft Designs designed a velocity stack to augment the intake airstream. Their velocity stack draws air from a 18.85" perimeter, accelerating and evenly distributing the air molecules across the inlet of the MAF. This methodical distribution of airflow from a larger area to a smaller area results in higher atmospheric pressures within the intake airstream and more accurate MAF readings. An overall increase in efficiency delivers power gains throughout the power band. Other intakes typically deliver top-end gains and low-end losses. Thanks to the velocity stack, their high-flow intake system delivers power from idle to redline. The photos above show various angles of the CNC machined velocity stack.

Massive 6 Inch Air Filter.

To compliment the airflow characteristics of the velocity stack a serious filter is needed. 42 Draft Designs chose a K&N filter with a 6 inch inlet and a 6 inch overall length. The shape of this filter allows the velocity stack to draw air equally from the sides without additional steps or turbulence. K&N filters were chosen based on their excellent reputation and proven performance. The photos above document just how massive this air filter really is!

Precision Fitment.

Precision fitment is the only fitment we offer. From o-rings to mounting brackets our high-flow intake system is built to fit like an OEM accessory. Starting with the MAF, their MAF adaptor follows the exact contour of the MAF flange, seals the nose, and allows the MAF to bolt to our intake system. The velocity stack slides through the heatshield and attaches to the MAF adaptor with a silicone o-ring seal. The heatshield is CNC waterjet cut from stainless steel, bent and TIG welded. Waterjet cutting gives us accurate shapes and repeatable fitment. Our mounting brackets are perfectly positioned to fit without bending or modification. Air filter placement is no accident. Precision placement of our velocity stack within the heatshield allows the air filter to install without touching the heatshield. This ensures the air filter will never be "banged-up" like other intakes. The photos above highlight the details and the overall fitment of this intake system.

Complete SAI Hardware.

Many intake systems fail to include proper secondary air injection hardware. Most include a filter and a zip tie leaving the installer to "figure it out." That approach is not good enough for our customers. To address the loose SAI tube 42 Draft Designs machined an adaptor which allows the installation of a small filter. This adaptor clicks into the SAI hose like a factory connection. No modification to the factory hose is necessary making this upgrade completely reversible. The adaptor allows the connection of a filter with a 1" inlet. The filter included is visibly larger than most SAI filters. This larger filter allows the SAI pump to breathe, keeping it quiet when in use. A stainless steel rubber lined clamp is included to support the assembled tube and filter.

The Details.

If you haven't noticed, 42 Draft Designs is obsessed with detail. They believe the quality of a product is only as great as the sum of the details. Their high-flow intake system is no exception. From the overall fitment down to the milling marks on the aluminum, nothing has been left to chance. Take a look at the detailed machining that lightens the velocity stack. Every edge is finished and chamfered. Take a look at the heatshield and notice how the cutouts allow the machine work to shine. This intake system is loaded with detail from top to bottom. The photos above highlight a few interesting details.

Power Gains:

It's impossible to definitively state how much horsepower and torque this intake, or any intake may provide. Power gains will always depend on the condition of your motor and the accompanying modifications. However, we can state with complete confidence that this high-flow intake will provide the highest gains possible when replacing a factory airbox.

This time around 42 Draft Designs used a bone stock 2004 AWP 1.8T GTI as a test car. The factory airbox and paper filter were replaced with their High-Flow Intake. No other modifications were done to the vehicle. Once the intake was installed gains were felt immediately. The car felt more powerful throughout the entire powerband. Spool-up time was decreased and boost pressure is maintained longer. We noticed no drop in low-end torque and felt big gains up top.

Because this car is essentially stock, power gains are limited by the restrictive exhaust and low boost pressures. A turbo-back exhaust system and a performance tune would greatly increase the gains felt by this intake. Dyno runs will follow shortly.

More Information
Brand 42 Draft Designs
Stock Type N/A
Write Your Own Review
You're reviewing:42 Draft Designs Mk4 1.8T High Flow Intake System
Your Rating