Intake Tubes

Has the old rubber hose cracked, or does the air filter need relocating in your project? Intake tubes connect the air filter to the engine's intake, and you can choose between universal tubes and bends for your own solutions or tube kits made for a specific car.

What does an intake tube do?

The tube guides the air from the filter to the engine. Smooth bends and a smooth inner surface can give less pressure loss than a ribbed stock tube, but the gain depends on the rest of the intake. If you are building a complete system, you can also look at cold air intakes, short ram intake kits or, on turbo engines, turbo inlet pipes.

How to choose intake tubes

• Diameter and length: Measure the connections first. For example, Spectre tubes are available with a 3-inch outer diameter in 4- and 6-inch lengths, as well as 45° bends.
• Material: ABS, aluminium and carbon fibre vary in weight, heat absorption and appearance. If the tube sits close to hot parts, a heat shield may be relevant.
• Fitment: Dinan's carbon fibre tube for the BMW M3 (08-13) and GReddy's aluminium kit for the BCNR33 Skyline are made for specific cars, while universal tubes require your own hoses and clamps.

Frequently asked questions

Can I combine universal tubes and bends?

Yes, straight tubes and bends are typically joined with silicone hoses and clamps. Check that the outer diameter matches the hoses and that the tube does not rest against hot or sharp parts in the engine bay.

Does a new intake tube need approval for inspection?

It depends on the product and the car. Changes to the intake can affect noise and emissions, so check for the specific part number whether approval or documentation is required before you go for inspection.

Why does the engine run rough after installation?

It can be caused by unmetered air at a leaking joint, or by the mass airflow sensor's position or the tube's diameter having been changed so the reading becomes incorrect. Check clamps and hoses, and stick to the diameter the engine management expects.