{"product_id":"exhaust-header-mockup-kit-1-75-tube-44-45mm-od-starter","title":"Exhaust Header Mockup Kit 1.75\" Tube (44.45mm OD) – 73pc STARTER","description":"\u003ch2\u003eExhaust header and manifold mockup blocks for 1.75\" mandrel bent tube\u003c\/h2\u003e\n\u003cp\u003eThe entry point into the Bendlabs system for builders working in tube rather than schedule pipe. 73 magnetic mockup blocks sized to 1.75\" outside diameter (44.45mm), the most widely stocked header primary size in the UK. Route all four primaries into a collector, check them against the block, chassis rail and steering shaft, and settle the design before you cut a single mandrel bend.\u003c\/p\u003e\n\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoute a complete four cylinder header or manifold in plastic before cutting tube\u003c\/li\u003e\n\u003cli\u003eBalance primary lengths by counting blocks instead of estimating\u003c\/li\u003e\n\u003cli\u003eDesign equal length headers where primary length actually matters to the powerband\u003c\/li\u003e\n\u003cli\u003eModel the merge collector and confirm the collector angle before you cut\u003c\/li\u003e\n\u003cli\u003eFind clearance problems on the bench rather than halfway through a weld\u003c\/li\u003e\n\u003cli\u003eProduce an exact cut list so you order the right mandrel bends first time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKit contents (73 pcs)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e6 × 30° 1D\u003c\/li\u003e\n\u003cli\u003e6 × 30° 1.5D\u003c\/li\u003e\n\u003cli\u003e6 × 45° 1D\u003c\/li\u003e\n\u003cli\u003e6 × 45° 1.5D\u003c\/li\u003e\n\u003cli\u003e6 × 90° 1D\u003c\/li\u003e\n\u003cli\u003e6 × 90° 1.5D\u003c\/li\u003e\n\u003cli\u003e12 × 15 mm straight\u003c\/li\u003e\n\u003cli\u003e8 × 25 mm straight\u003c\/li\u003e\n\u003cli\u003e4 × 50 mm straight\u003c\/li\u003e\n\u003cli\u003e2 × 75 mm straight\u003c\/li\u003e\n\u003cli\u003e2 × 100 mm straight\u003c\/li\u003e\n\u003cli\u003e2 × 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\u003e73\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\u003eIs this the same as your 1.5\" NPS SCH10S kit?\u003c\/strong\u003e\u003cbr\u003e\nNo. That kit is 48.3mm OD schedule 10 pipe. This one is 44.45mm OD mandrel bent tube. The blocks are a different size and will not connect to each other.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube or pipe, which should I be building in?\u003c\/strong\u003e\u003cbr\u003e\nMandrel bent tube in 1.75\" OD is the standard for naturally aspirated headers and plenty of turbo work, and it is what most UK suppliers stock. Schedule 10 pipe has a thicker wall and is favoured for high temperature turbo manifolds. Order the kit that matches the material you buy.\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\u003eIs 73 pieces enough for a four cylinder header?\u003c\/strong\u003e\u003cbr\u003e\nYes, for a straightforward four cylinder layout. Tight engine bays needing heavily convoluted primaries may use more, in which case add a bend pack or step up to the 136pc BUILDER kit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy 1.75\"?\u003c\/strong\u003e\u003cbr\u003e\nIt is the most common header primary size in the UK and the one every mandrel bend supplier carries. If you need another tube diameter, get in touch and we will quote it.\u003c\/p\u003e","brand":"Bendlabs","offers":[{"title":"Default Title","offer_id":54845589389653,"sku":"EMK-STARTER-T175","price":189.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/9364\/5653\/files\/STARTER_exhaust_modelling_kit_Custom_7b5c1ae6-c51a-4e29-a845-37946f730242.jpg?v=1788530570","url":"https:\/\/bendlabs.co.uk\/products\/exhaust-header-mockup-kit-1-75-tube-44-45mm-od-starter","provider":"Bendlabs","version":"1.0","type":"link"}