{"product_id":"spark-exhaust-bent-tube-45-degrees-45mm","title":"Spark Exhaust Bent Tube 45° Ø 45 × 1.0 mm Stainless Steel Universal G9105","description":"\u003cp\u003eForty-five millimetres through forty-five degrees. The angle most exhaust routing is made of, in a diameter that carries a large twin on its own.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMandrel-formed 45° bend, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 45 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eStraight tangents at both ends.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 45 mm straight tube, article G9002.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9105, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCrossover Pipes\u003c\/h2\u003e\u003cp\u003eOn a large V-twin, or a parallel twin with widely spaced headers, the two runs have to meet somewhere. A pair of 45° bends is the usual way of bringing them together into a collector without either pipe arriving at a hard angle.\u003c\/p\u003e\u003cp\u003eEqual lengths matter more than short ones. Unequal primaries on a twin change the character of the engine, and not usually in the direction the owner wanted.\u003c\/p\u003e\u003ch2\u003eFitting to a Header Flange\u003c\/h2\u003e\u003cp\u003eWhere a fabricated run meets a factory header the joint is a flange or a sprung slip fit, and neither tolerates a bend welded hard against it. Leave a short straight before the flange so the joint can be aligned independently of how the bend is clocked.\u003c\/p\u003e\u003cp\u003eIt also means the flange can be replaced later without cutting the bend out.\u003c\/p\u003e\u003ch2\u003eWeld Sequence Around a Curve\u003c\/h2\u003e\u003cp\u003eTack four points, check the assembly against the motorcycle, then weld in opposing quarters. On a bend the pull as the weld cools acts along the curve rather than along a straight line, so the distortion shows up as a change of angle rather than a step in the joint — harder to spot and harder to correct.\u003c\/p\u003e\u003ch2\u003eTwo Bends and a Straight\u003c\/h2\u003e\u003cp\u003eTwo of these facing the same way, with a straight between, give a right angle with a built-in offset. Facing opposite ways they give an S. Almost every routing problem on a motorcycle is one of those two shapes, and both are built from this article twice.\u003c\/p\u003e\u003ch2\u003eSpringback, and Why It Is Not Your Problem\u003c\/h2\u003e\u003cp\u003eStainless returns four to eight degrees after a bender releases it, which is why hand-made bends come out shallower than intended. A production bend has that compensation built into the tooling: it arrives at forty-five measured, not forty-five attempted.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark builds 30°, 45°, 90° and 180° at this diameter — the widest choice of angles in the range.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618179244298,"sku":"G9105","price":273.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5c0e999867bba_46d8b65c-3a15-4b46-adb4-e7403be62753.png?v=1788354251","url":"https:\/\/inter-pace.com\/en-hk\/products\/spark-exhaust-bent-tube-45-degrees-45mm","provider":"Inter-Pace","version":"1.0","type":"link"}