{"product_id":"exhaust-header-mockup-kit-1-75-tube-44-45mm-od-builder","title":"Exhaust Header Mockup Kit 1.75\" Tube (44.45mm OD) – 136pc BUILDER","description":"\u003ch2\u003eExhaust header and manifold mockup blocks for 1.75\" mandrel bent tube\u003c\/h2\u003e\n\u003cp\u003eOur standard shop kit for builders working in tube. 136 magnetic mockup blocks sized to 1.75\" outside diameter (44.45mm), enough to model a four or six cylinder header with blocks spare to trial a second routing before you settle on it. The extra volume over the STARTER kit is what lets you build two versions side by side and pick the better one, rather than dismantling a good design to test an idea.\u003c\/p\u003e\n\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eModel four and six cylinder headers and manifolds in full, with blocks spare for alternatives\u003c\/li\u003e\n\u003cli\u003eTrial competing primary routes without breaking down the first attempt\u003c\/li\u003e\n\u003cli\u003eBalance equal length primaries by block count\u003c\/li\u003e\n\u003cli\u003eModel the merge collector and confirm the collector angle before you cut\u003c\/li\u003e\n\u003cli\u003eConfirm turbo, wastegate and downpipe clearance before any tube is cut\u003c\/li\u003e\n\u003cli\u003eGenerate an accurate cut list and material order\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKit contents (136 pcs)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e12 × 30° 1D\u003c\/li\u003e\n\u003cli\u003e12 × 30° 1.5D\u003c\/li\u003e\n\u003cli\u003e12 × 45° 1D\u003c\/li\u003e\n\u003cli\u003e12 × 45° 1.5D\u003c\/li\u003e\n\u003cli\u003e12 × 90° 1D\u003c\/li\u003e\n\u003cli\u003e12 × 90° 1.5D\u003c\/li\u003e\n\u003cli\u003e25 × 15 mm straight\u003c\/li\u003e\n\u003cli\u003e12 × 25 mm straight\u003c\/li\u003e\n\u003cli\u003e6 × 50 mm straight\u003c\/li\u003e\n\u003cli\u003e4 × 75 mm straight\u003c\/li\u003e\n\u003cli\u003e4 × 100 mm straight\u003c\/li\u003e\n\u003cli\u003e6 × Flexible Flange Adapters\u003c\/li\u003e\n\u003cli\u003e5 × Flat Pipe Measuring Gauges\u003c\/li\u003e\n\u003cli\u003e1 × Pipe Guide\u003c\/li\u003e\n\u003cli\u003e1 × Heavy Duty Plastic Carry Case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTube compatibility\u003c\/h3\u003e\n\u003cp\u003eMatched to 1.75\" outside diameter mandrel bent exhaust tube, 44.45mm OD. This is a tube kit, not a pipe kit. Tube is sized by its actual outside diameter, while NPS pipe is sized by nominal bore, so 1.75\" tube is not interchangeable with our 1.25\" or 1.5\" NPS SCH10S kits. If you are building in schedule 10 pipe, choose one of those instead.\u003c\/p\u003e\n\n\u003ch3\u003eBend radii on tube\u003c\/h3\u003e\n\u003cp\u003eOn tube, D refers to the actual outside diameter. 1D is therefore a 44.45mm centreline radius and 1.5D is 66.7mm. This differs from our NPS pipe kits, where D follows the nominal size rather than the OD, so blocks will not match across the two systems.\u003c\/p\u003e\n\u003cp\u003eThis kit ships with 1D and 1.5D bends. A wider \u003cstrong\u003e2D radius (88.9mm CLR)\u003c\/strong\u003e is available separately in our 1.75\" tube bend add-on packs, for long sweeping primaries where flow matters more than packaging.\u003c\/p\u003e\n\n\u003ch3\u003eHeader mockup, step by step\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the flange adapters to your head flange or turbo flange\u003c\/li\u003e\n\u003cli\u003eSnap bends and straights together, rotating each joint to clear obstructions\u003c\/li\u003e\n\u003cli\u003eAdjust until every primary is routed and the lengths are balanced\u003c\/li\u003e\n\u003cli\u003eCount your blocks for the cut list, then cut, tack and TIG weld to match\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTube size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.75\" OD (44.45mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBend radii\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1D (44.45mm CLR) and 1.5D (66.7mm CLR). 2D available as an add-on\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBend angles\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30°, 45°, 90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eJoint\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFriction fit with embedded magnets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePieces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e136\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufactured\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order in our UK workshop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eMade to order in Britain\u003c\/h3\u003e\n\u003cp\u003eEvery kit is produced to order in our own workshop rather than pulled off a shelf. That is why we can supply centreline radii and tube sizes the imported kits do not offer. Need a size that is not listed? Get in touch and we will quote it.\u003c\/p\u003e\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBUILDER or STARTER?\u003c\/strong\u003e\u003cbr\u003e\nSTARTER covers a single four cylinder header. BUILDER gives you enough blocks for six cylinder work, or for trying two routings on a four cylinder without dismantling the first.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBUILDER or WORKSHOP?\u003c\/strong\u003e\u003cbr\u003e\nBUILDER suits most one man shops. WORKSHOP adds enough volume for V8 header work and for keeping several projects mocked up at once.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I get 2D bends for this kit?\u003c\/strong\u003e\u003cbr\u003e\nYes. Our 1.75\" tube add-on packs cover 30°, 45° and 90° in 1D, 1.5D and 2D, so you can add the wider 88.9mm CLR radius to the 1D and 1.5D blocks supplied here.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill these blocks work with my 1.25\" or 1.5\" NPS kit?\u003c\/strong\u003e\u003cbr\u003e\nNo. Tube and pipe are different diameters and each size is a separate system. Blocks will not connect across sizes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I mix 1D and 1.5D bends in one header?\u003c\/strong\u003e\u003cbr\u003e\nYes, and most builds do. Tight 1D bends get you round obstructions, 1.5D bends flow better on the open sections. Both radii are included in equal quantity.\u003c\/p\u003e","brand":"Bendlabs","offers":[{"title":"Default Title","offer_id":54845592568149,"sku":"EMK-BUILDER-T175","price":289.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/9364\/5653\/files\/BUILDER_exhaust_modelling_kit_Custom_44bbe0b4-eefc-4cb1-8079-efd68e0c2f7c.jpg?v=1788530580","url":"https:\/\/bendlabs.co.uk\/products\/exhaust-header-mockup-kit-1-75-tube-44-45mm-od-builder","provider":"Bendlabs","version":"1.0","type":"link"}