Bicos Exhaust Pipe Expander Stretcher Tool Set 1-5/8"–4-1/4" Hex 28mm, collet-driven for muffler repair

Bicos Exhaust Pipe Expander Stretcher Tool Set is a complete collet-driven kit that enlarges and reshapes muffler and exhaust tubing from 1-5/8" up to 4-1/4" for reliable fitment and repair.

This kit is built for mechanics, fabricators, and DIYers who need to expand or reshape exhaust pipes quickly and repeatably. It combines hardened steel and lightweight aluminum alloy expanders with a range of interchangeable collets to cover common pipe diameters, and it stores neatly in a compact case for shop or roadside use. The tool's 28mm hex drive and 3/4"-10 thread allow compatibility with standard wrenches and threaded drivers for controlled, mechanical expansion.

How does this expander handle different exhaust pipe sizes?

The set includes multiple collets that nest on two main expander bodies — one steel and one aluminum alloy — so you can step through sizes without needing separate specialty tools. Each collet is sized for a specific start-to-finish spread, enabling gradual expansion and better control.

• Steel expander covers 1-5/8"–2" and 2"–2-1/2" ranges.
• Aluminum expander covers 2-3/8"–4-1/4" across five collets.
• Collets install quickly and lock for steady operation.

What tools and fittings are required to operate the kit?

Operation requires a hex driver or socket that fits the 28mm hex and a threaded driver or wrench for the 3/4"-10 spindle — items commonly available in automotive tool sets. The kit's design lets you advance the mandrel to expand the pipe evenly without improvising with jacks or hammers.

• Use a 28mm socket or wrench on the expander body hex.
• 3/4"-10 threaded mandrel accepts standard drivers.
• No welding or heat required for most reshaping tasks.

Is the construction durable enough for professional shop use?

Yes. The set pairs hardened steel components for high-stress collet sizes with aluminum-alloy expanders where lighter weight and corrosion resistance are beneficial. Materials and machining tolerances are selected to withstand repeated expansion cycles common in exhaust repair and fabrication.

• Hardened steel expanders for heavy-duty sections.
• Aluminum alloy bodies reduce weight while retaining strength.
• Precision threads and surfaces for consistent operation.

What’s included and how is it stored for transport?

The kit ships with a full complement of collets covering the 1-5/8" to 4-1/4" range, two expander bodies (steel and aluminum alloy), a threaded mandrel assembly, and a molded storage case. The case keeps parts organized and protected so you can bring the set to roadside jobs or keep it on the bench without losing pieces.

• Complete set of steel and aluminum collets for incremental expansion.
• Two expanders: steel for smaller/heavier jobs, aluminum for larger diameters.
• Molded storage case with labeled recesses for each component.

Who is this for: The Bicos Exhaust Pipe Expander Stretcher Tool Set is ideal for professional mechanics, muffler shops, custom exhaust fabricators, and serious home mechanics who frequently repair or build exhaust systems. If you need controlled, repeatable pipe enlargement across a wide diameter range and prefer a compact, organized kit that works with common wrenches and threaded drivers, this tool set delivers practical capability without specialty machinery.