{"product_id":"spark-exhaust-bent-tube-90-degrees-40mm","title":"Spark Exhaust Bent Tube 90° Ø 40 × 1.0 mm Stainless Steel Universal G9103","description":"\u003cp\u003eForty millimetres through ninety degrees. Together with the 45 at the same diameter, this is most of what a custom system is built from.\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 40 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 40 mm straight tube, article G9001.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9103, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThe Two-Bend System\u003c\/h2\u003e\u003cp\u003eA right angle off the collector and a forty-five into the silencer position covers a large proportion of one-off builds. The ninety does the turn where space is tightest and the geometry is least negotiable; everything after it is aiming.\u003c\/p\u003e\u003cp\u003eA straight between the two turns a pair of fixed angles into an adjustable layout, and the length of that straight is usually the last thing decided.\u003c\/p\u003e\u003ch2\u003eWhere the Loss Actually Is\u003c\/h2\u003e\u003cp\u003eNot in the corner itself but just after it. Gas leaving a sharp bend is separated from the inside wall and takes several tube diameters to reattach. Anything placed in that region — a second bend, a sensor boss, a joint — sees disturbed flow.\u003c\/p\u003e\u003cp\u003eLeaving a short straight after a ninety costs nothing and recovers most of it.\u003c\/p\u003e\u003ch2\u003eSweep and Clearance\u003c\/h2\u003e\u003cp\u003eA production ninety at this diameter occupies a square roughly a hundred millimetres on a side once the tangents are counted. That is the space it needs, and it is worth drawing before ordering: the most common surprise on a first build is a bend that fits the pipe run and not the motorcycle.\u003c\/p\u003e\u003ch2\u003eHalf a Ninety\u003c\/h2\u003e\u003cp\u003eCut at the apex, this bend gives two forty-fives — each with a straight tangent on one end and a cut on the other. Useful to know when a job needs one right angle and one shallow corner and only one article is on the shelf.\u003c\/p\u003e\u003ch2\u003eDistortion as It Cools\u003c\/h2\u003e\u003cp\u003eA weld pulls as it solidifies, and on a right angle that pull acts across the corner rather than along a line. Tack at four points, check with a square, and run the bead in opposing quarters — a ninety welded continuously round from one side is not a ninety afterwards.\u003c\/p\u003e\u003ch2\u003eBuy the Angle You Can Reduce\u003c\/h2\u003e\u003cp\u003eA right angle can become anything shallower with a saw. A thirty cannot become anything larger. Where the geometry is not yet settled, the sharper article is the safer one on the bench.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark builds 30°, 45° and 90° at this diameter.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618248286474,"sku":"G9103","price":38.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5c0e99b90896e_abdc3f75-fea4-47ac-9579-7584c08551f8.png?v=1788354285","url":"https:\/\/inter-pace.com\/products\/spark-exhaust-bent-tube-90-degrees-40mm","provider":"Inter-Pace","version":"1.0","type":"link"}