{"product_id":"spark-exhaust-bent-tube-90-degrees-54mm","title":"Spark Exhaust Bent Tube 90° Ø 54 × 1.0 mm Stainless Steel Universal G9109","description":"\u003cp\u003eFifty-four millimetres through ninety degrees. The corner immediately after a litre-class collector — the one with the least room and the most heat in the whole system.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMandrel-formed 90° bend, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 54 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 54 mm straight tube, article G9003.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9109, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThe Corner Nobody Has Room For\u003c\/h2\u003e\u003cp\u003eOn a big four the collector sits close to the engine and is surrounded by things that cannot move: the swingarm pivot, the shock linkage, the rear brake master cylinder. The pipe leaving it usually has to turn hard, immediately, in a space measured in centimetres.\u003c\/p\u003e\u003cp\u003eThat corner decides whether a one-off system is possible at all. Everything after it is comparatively easy, which is why it is the piece to mock up in cardboard first.\u003c\/p\u003e\u003ch2\u003eMocking It Up Before Ordering\u003c\/h2\u003e\u003cp\u003eCut the outline of the bend from stiff card, including the straight tangents, and hold it where the pipe has to go. Five minutes of card answers a question that a drawing usually gets wrong, and the article cannot be shortened in any useful way if the answer turns out to be no.\u003c\/p\u003e\u003ch2\u003eWhy Not to Reheat It Straight\u003c\/h2\u003e\u003cp\u003eThe material in a formed bend has been work-hardened unevenly, and heating it to red to persuade it into a different angle undoes that unevenly too. The result is a soft patch on the outer heel, exactly where the wall is already thinnest from forming.\u003c\/p\u003e\u003cp\u003eIf the angle is wrong, cut it and rejoin. Never bend it further.\u003c\/p\u003e\u003ch2\u003eTwo Mounts, Not One\u003c\/h2\u003e\u003cp\u003eA right angle carrying the weight of everything behind it needs support on both sides. One mount turns the bend into a hinge and puts every vibration cycle through the tangent weld; two make it a beam. At least one of them should be rubber-isolated.\u003c\/p\u003e\u003ch2\u003ePassivating After the Weld\u003c\/h2\u003e\u003cp\u003ePickling paste removes the chromium-depleted oxide band beside a weld and lets the passive layer reform. On a bend right off a collector — hot, wet in winter, and never cleaned — skipping it is what turns a stainless system rusty in one season.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Available in 30°, 45° and 90° at this diameter.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618249040138,"sku":"G9109","price":1686.0,"currency_code":"UAH","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5c0e99ccd383f_120c03bf-94f0-46d7-9169-b5b0d7c4cf28.png?v=1788354308","url":"https:\/\/inter-pace.com\/en-ua\/products\/spark-exhaust-bent-tube-90-degrees-54mm","provider":"Inter-Pace","version":"1.0","type":"link"}