AC PERFORMANCE 3.5" Straight Aluminum Intercooler Pipe — 11.8in Brushed 6061 Alloy, 2mm Wall, Mandrel-Quality

AC PERFORMANCE's 3.5" (89mm) straight aluminum intercooler pipe is a 11.8" (300mm) brushed-finish intake tube made from 6061 alloy, engineered for custom turbo, intercooler and air-intake installations.

This straight aluminum pipe provides a robust, uniform-diameter section you can cut, splice or weld into your forced-induction or intake plumbing. With a 3.5" outside diameter (approximately 84.8–85mm inside) and 2mm wall thickness, it balances strength and workability so fabricators and DIYers can adapt it to a wide range of automotive cooling and intake setups. The brushed surface treatment reduces visual fingerprints while offering a durable finish that blends into engine bays or custom builds.

What are the precise dimensions and materials of this intercooler pipe?

The tube measures 3.5" (89mm) outside diameter, with an inside diameter near 84.8–85mm and a wall thickness of 0.078" (2mm). The overall length is 11.8" (300mm). It is produced from 6061 aluminum alloy, chosen for its strength, corrosion resistance and weldability, which makes it suitable for performance plumbing.

• Outside diameter: 3.5" / 89mm
• Approximate inside diameter: 84.8–85mm
• Length: 11.8" / 300mm
• Wall thickness: 0.078" / 2mm
• Material: 6061 aluminum alloy

How does this pipe perform in custom intake or intercooler setups?

The straight section preserves consistent airflow through a forced-induction run, helping avoid abrupt transitions that create turbulence. It is designed for mandrel-precision so the bore stays uniform along the length, promoting smoother air movement. Because it’s straight and sized for common couplers, it integrates easily with silicone joins, clamps or welded transitions.

• Mandrel-quality inner profile for even airflow
• Works with standard 3.5" couplers and clamps
• Can be trimmed to length or welded into assemblies
• Brushed finish lowers visible fingerprints and blends visually

Can I modify this tube for my application and how should I attach it?

Yes — the 6061 alloy and 2mm wall thickness make the pipe easy to cut, splice, and weld or to join with silicone couplers and T-bolt clamps. If welding, use proper filler and technique for aluminum; for clamp joins, match the inner diameter to compatible couplers. The straight form is intentionally simple to let fabricators tailor bends or transitions as required.

• Cut with a fine-tooth blade or rotary tool for clean edges
• Weld using TIG processes with appropriate aluminum filler
• Use 3.5" silicone couplers and T-bolt clamps for clamp-on joins
• Deburr ends before joining to preserve seal quality

Will this pipe fit my vehicle’s intercooler or intake layout?

This straight tube is a universal component meant to be adapted into many systems rather than a vehicle-specific part. It’s ideal where a short straight section of 3.5" diameter is required between couplers, sensors, or transitions. Confirm available space and coupling sizes in your layout before ordering to ensure proper fit and clearances.

• Universal straight section, not vehicle-specific
• Best used where a 3.5" straight length is needed
• Measure clearance and coupling compatibility first
• Suitable for intercooler, intake, or cooling plumbing

Who this is for: This AC PERFORMANCE 3.5" straight aluminum intercooler pipe suits mechanics, fabricators and car enthusiasts building or modifying turbo, intercooler and intake systems. It’s aimed at anyone needing a high-quality, adaptable 3.5" section they can trim, weld or clamp into place—especially useful for custom piping runs, patching existing plumbing, or creating smooth transitions in performance cooling setups.