Tongze 2.5" Cold Air Intake Pipe — Universal Flexible PVC Duct, Adjustable 9.5"–40", Reinforced Metal-Core

Tongze's 2.5-inch cold air intake pipe is a universal, extendable PVC duct with a metal wire core that lets you build or modify an air intake hose from 9.5" up to 40".

This flexible intake tube is designed for DIY engine bay work where a custom-length, lightweight, high-flow duct is needed. Constructed from reinforced PVC with an internal metal helix, the hose holds shape under routing while remaining bendable so you can position it around components. It’s intended for vehicles that accept a 2.5" (63 mm) intake connection and for enthusiasts who want to change airflow path, replace a damaged duct, or prototype a cold-air arrangement.

How does this pipe improve or change my intake setup?

The Tongze intake pipe provides a larger, smoother pathway for incoming air compared with many narrow rubber ducts, helping reduce restrictions and smoothing airflow into the throttle body or mass airflow meter. Because it’s lightweight and engineered for high airflow, it’s commonly used in custom or performance-oriented builds where routing or intake length is deliberate.

• 2.5" (63 mm) inside diameter matches common intake ports and couplers.
• Metal wire core keeps the tube’s shape during bends and under vacuum.
• Light PVC body minimizes added weight in the engine bay.
• Extendable length lets you tailor routing for optimal air pathing.

Can I fit this on my car and how do I measure compatibility?

Measure the inner diameter of the existing intake hose or the throttle body inlet; the Tongze tube is built for a 2.5" (63 mm) connection. Also check available routing space from about 9.5" up to 40" to be sure the extended tube will clear engine components and meet filter or adapter locations.

• Confirm the mating flange or coupler accepts 2.5" ID hoses.
• Allow clearance for bends and heat sources when choosing length.
• Use proper clamps and adapters for a sealed connection.

What materials and construction make this suitable for automotive use?

Tongze uses a durable PVC shell reinforced with a coiled metal wire to combine flexibility and structural integrity. That blend means the tube resists collapsing while bent and handles ordinary engine-bay vibrations and airflow without deforming.

• PVC exterior stands up to moderate heat and abrasion in protected routes.
• Metal helix keeps the lumen open during tight turns.
• Design prioritizes airflow with a smooth interior compared to corrugated hoses.

How do I install or customize the length for my project?

Cut the tube to the length you need using a sharp tool, then secure it with quality hose clamps and appropriate silicone or rubber couplers. The built-in wire reinforcement allows clean bends, so position the tube to avoid kinks and keep it away from direct exhaust or extreme heat sources.

• Trim with a utility knife or fine-tooth saw for a straight edge.
• Use heavy-duty worm-drive clamps for a leak-free seal.
• Add short silicone adapters for mismatched diameters or mounting points.

Who is this for: The Tongze 2.5" cold air intake pipe is aimed at car owners, tuners, and mechanics who need a reliable, modifiable duct for custom intake plumbing, replacements, or race-inspired routing. It suits vehicles already using 2.5" intake connections and DIY builders who want a lightweight, shape-retaining hose they can cut and fit themselves. If you require off-the-shelf plastic airboxes or factory-specific molded ducts, this universal tube may not be the right match; but for flexible custom work and prototype installs, it’s a practical, economical option. The product comes with a 30-day warranty and has been inspected before shipping for build quality.