{"product_id":"spark-exhaust-bent-tube-45-degrees-38mm","title":"Spark Exhaust Bent Tube 45° Ø 38 × 1.0 mm Stainless Steel Universal G9136","description":"\u003cp\u003eThirty-eight millimetres at forty-five degrees. The angle most systems are built from, in the diameter a middleweight twin breathes through.\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 38 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eStraight tangents at both ends for cutting and welding.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 38 mm straight tube, article G9007.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9136, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAround the Shock\u003c\/h2\u003e\u003cp\u003eOn most modern middleweights the single rear shock and its reservoir sit exactly where an exhaust would like to run. Getting past them is the routing problem the system is designed around, and forty-five degrees is the angle that does it: enough to step out and back, not so much that the run doubles its own length.\u003c\/p\u003e\u003cp\u003eMeasure the clearance hot, not cold. A shock body that clears by ten millimetres on the bench will clear by less once the exhaust has expanded and the suspension has compressed.\u003c\/p\u003e\u003ch2\u003eWhy This Angle Dominates a Rack\u003c\/h2\u003e\u003cp\u003eBecause it is the only one that is useful on its own and useful in pairs. A single 45 turns a corner. Two of them opposed make an S. Two of them facing the same way make a right angle with an offset. Three make a full U in stages.\u003c\/p\u003e\u003cp\u003eA fabricator buying one angle in quantity buys this one, and a fabricator buying three buys more of this one than the other two put together.\u003c\/p\u003e\u003ch2\u003eThe Middleweight Diameter\u003c\/h2\u003e\u003cp\u003eThirty-eight is a common header size on parallel twins from 650 to 900 cc, and the internal bore of the Grid-O insert Spark supplies with its MT-07 and XSR700 systems. Building around that platform means building in this diameter.\u003c\/p\u003e\u003ch2\u003eTacking a Bend to a Straight\u003c\/h2\u003e\u003cp\u003eFour tacks at ninety degrees to each other, then stop and check. Thin-wall stainless pulls as it cools and a joint tacked at two points will not be straight afterwards. Run the finished bead in opposing quarters for the same reason.\u003c\/p\u003e\u003ch2\u003eBack-Purging Past a Bend\u003c\/h2\u003e\u003cp\u003eA curved run holds gas differently from a straight one, and a bend can trap a pocket of air at its high point. Give the purge longer than seems necessary before striking an arc — a sugared root inside a bend is invisible until the joint cracks a season later.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark builds 30°, 45° and 90° at this diameter, plus a 500 mm straight.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618174230794,"sku":"G9136","price":60.0,"currency_code":"AZN","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/6087d4723e23c_db630b3e-1af3-45c2-811d-0c1bb981ca05.png?v=1788347965","url":"https:\/\/inter-pace.com\/en-az\/products\/spark-exhaust-bent-tube-45-degrees-38mm","provider":"Inter-Pace","version":"1.0","type":"link"}