{"product_id":"prokomon-exhaust-pipe-expander-tool-1-5-8-4-1-4-in-kit-5-collets-aluminum-alloy-steel","title":"Prokomon Exhaust Pipe Expander Tool 1-5\/8–4-1\/4 in Kit — 5 Collets, Aluminum \u0026 Alloy Steel","description":"\u003cp\u003e\u003cstrong\u003eProkomon Exhaust Pipe Expander Tool is a rugged stretcher kit that enlarges mild-steel tailpipes from roughly 1-5\/8\" up to 4-1\/4\" so you can form tight, leak-free seals when joining sections or fitting smaller-diameter pipes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact kit gives DIYers and pros a simple way to reshape and flare exhaust tubing without costly shop equipment. The system uses interchangeable collets and a hardened expander to roll and spread pipe ends evenly, producing a consistent finish ready for clamps, welds, or slip-fit connections. Built from aircraft-grade aluminum and tempered alloy steel, the set balances low weight with long-term durability for frequent use.\u003c\/p\u003e\n\n\u003ch3\u003eHow wide a range of pipe diameters does this expander handle?\u003c\/h3\u003e\n\u003cp\u003eThe Prokomon kit covers a broad set of tailpipe sizes so you can work on a variety of vehicles and aftermarket parts. Collets step up incrementally to accommodate small passenger exhausts through larger performance pipes, minimizing the need for additional tools.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits nominal pipe sizes from 2-3\/8\" up to 4-1\/4\" with five stepped collets.\u003c\/li\u003e\n  \u003cli\u003eCollet ranges: 2-3\/8\"→2-3\/4\", 2-3\/4\"→3-1\/8\", 3-1\/8\"→3-1\/2\", 3-1\/2\"→3-7\/8\", 3-7\/8\"→4-1\/4\".\u003c\/li\u003e\n  \u003cli\u003eUseful for common mild-steel tailpipes and many aftermarket tips and reducers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use the exhaust pipe stretcher safely and quickly?\u003c\/h3\u003e\n\u003cp\u003eOperation is straightforward: pick the matching collet for the pipe, clamp it in place, then expand by unrolling the expander barrel. Using a 1\/2\" or 3\/4\" impact wrench speeds the process, but hand tools will also work for occasional jobs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSelect the collet closest to the pipe’s current ID for an even spread.\u003c\/li\u003e\n  \u003cli\u003eSecure the collet and rotate\/unroll the expander evenly around the circumference.\u003c\/li\u003e\n  \u003cli\u003eWork gradually to avoid over-expansion; check fit frequently against mating parts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and build quality should I expect from this kit?\u003c\/h3\u003e\n\u003cp\u003eProkomon designed the set for repetitive shop use while keeping weight manageable. Collets are machined from 6061 aircraft-grade aluminum, offering corrosion resistance and accurate profiles, while the main expander shaft uses hardened 40Cr alloy steel for strength and wear resistance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCollars: 6061 aluminum — lightweight and dimensionally stable.\u003c\/li\u003e\n  \u003cli\u003eExpander body: tempered 40Cr alloy steel for rigidity and longevity.\u003c\/li\u003e\n  \u003cli\u003eEngineered for repeated expansion tasks without losing shape or grip.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit work for welding, clamping, or slip-fit installations?\u003c\/h3\u003e\n\u003cp\u003eYes — the tool prepares pipe ends to accept clamps, sleeves, or to be tacked and welded. The uniform expansion produces an even contact surface so sealing and alignment are much easier during final assembly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCreates clean, evenly flared ends for clamp-on tips and slip joints.\u003c\/li\u003e\n  \u003cli\u003eMakes alignment faster when tack-welding or installing reducers.\u003c\/li\u003e\n  \u003cli\u003eReduces the chance of gaps that lead to exhaust leaks when joined correctly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Prokomon Exhaust Pipe Expander Kit is aimed at home mechanics, muffler shops, and mobile technicians who need a repeatable, portable solution for fitting and repairing tailpipes. If you regularly modify exhausts, install aftermarket tips, or restore vintage systems, this kit speeds prep work and improves final fits without oversized equipment.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What pipe sizes does the Prokomon expander cover?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It expands pipe ends from about 2-3\/8\" up to 4-1\/4\" using five stepped collets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use an impact wrench with this kit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. A 1\/2\" or 3\/4\" impact wrench speeds expansion, though hand tools also work.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Prokomon","offers":[{"title":"Default Title","offer_id":48083868352670,"sku":"B07XT9Z9ZD","price":93.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/prokomon-expander-front-view.jpg?v=1785837778","url":"https:\/\/northtrailauto.ca\/products\/prokomon-exhaust-pipe-expander-tool-1-5-8-4-1-4-in-kit-5-collets-aluminum-alloy-steel","provider":"North Trail Auto","version":"1.0","type":"link"}