304 S/S TAPERED CONE - 4" (102MM) OD UP TO 5" (127MM) X 3 1/2" (89MM) LONG

304 Stainless Steel Tapered Cone | 4" (102mm) to 5" (127mm) OD x 3-1/2" (89mm) Long | CONE405035-304

This 304 stainless steel tapered cone is a premium fabrication component designed for custom exhaust, intake, and pipework builds where a smooth, professional transition between two different pipe diameters is required. Expanding from a 4" (102mm) OD to a 5" (127mm) OD over a length of 3-1/2" (89mm), this cone provides a gradual, flow-optimised taper that minimises turbulence and back pressure in high-performance exhaust and induction systems.

Product Specifications

• Part Number: CONE405035-304
• Material: 304 Stainless Steel
• Small End OD: 4" (102mm)
• Large End OD: 5" (127mm)
• Length: 3-1/2" (89mm)
• Weight: 15oz (approx. 425g)
• Barcode: 29439

Applications

Purpose-built for custom fabrication across a wide range of performance and motorsport applications, including:

• Custom exhaust system fabrication — collector to pipe transitions
• Exhaust merge collector outlets and tailpipe expansions
• Turbo outlet and downpipe diameter transitions
• Custom intake and induction pipework
• Intercooler piping diameter changes
• Hot rod, street rod, and race car exhaust builds
• Any application requiring a smooth 4" to 5" pipe transition

Why 304 Stainless Steel?

304 stainless steel is the industry standard for performance exhaust and fabrication components, offering excellent resistance to heat, oxidation, and corrosion. Unlike mild steel, 304 SS maintains its structural integrity and appearance under the sustained high temperatures of performance exhaust systems, making it the preferred choice for builds where longevity and finish quality matter. It is also fully weldable using TIG or MIG processes, allowing for clean, strong joins in custom fabrication work.

Sold individually. Can be welded directly to matching OD stainless or mild steel pipe. Verify OD dimensions against your pipe wall thickness to ensure a flush fit prior to welding.