{"product_id":"dinan-free-flow-axleback-exhaust-polished-tips-bmw-f8x-m3-m4","title":"Dinan Free Flow Axle-Back Exhaust with Polished Tips - BMW F80 M3 (2015-2018) \/ F82 \/ F83 M4 (2015-2020)","description":"\u003cp\u003eThe S55 in your F80 M3 or F82 M4 has a great voice. The factory mufflers just keep it on a short leash. The Dinan Free Flow Axle-Back Exhaust lets it out, with a sharper, more aggressive note under acceleration and less drone when you're cruising.\u003c\/p\u003e\u003cp\u003eDinan builds it from 100% T304 stainless steel and finishes it with four 3.5 inch laser engraved polished tips. It reuses your factory valve actuators, so the M Drive exhaust settings work the way they did from the factory: civil when you want it, wide open when you ask for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow the Dinan F80 M3 \/ F82 M4 Axle-Back Exhaust Works\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eComputer controlled valves limit noise during low speed driving and open fully under high load. Dinan's twin secondary valves measure 76mm, which Dinan rates at 45% less restrictive than the factory valves. Drone abatement keeps cabin resonance down on long drives, and the system weighs 3 lbs less than stock. Dinan rates the gain at +5 hp.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePolished or Black Tips\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis listing is the polished stainless tip version. If you'd rather have a stealthier look, the same system is available with \u003ca href=\"\/products\/dinan-free-flow-axleback-exhaust-black-tips-bmw-f8x-m3-m4\"\u003eblack ceramic tips\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDinan Free Flow axle-back exhaust system with four 3.5 inch polished tips\u003c\/li\u003e\n\u003cli\u003eClamps\u003c\/li\u003e\n\u003cli\u003eHangers\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e100% T304 stainless steel construction\u003c\/li\u003e\n\u003cli\u003eQuad 3.5 inch laser engraved polished tips\u003c\/li\u003e\n\u003cli\u003eFactory valve actuators reused, M Drive exhaust settings retained\u003c\/li\u003e\n\u003cli\u003eTwin 76mm secondary valves, 45% less restrictive than the factory valves (Dinan rating)\u003c\/li\u003e\n\u003cli\u003eDrone abatement for a quieter cabin at cruise\u003c\/li\u003e\n\u003cli\u003e3 lbs lighter than the factory system\u003c\/li\u003e\n\u003cli\u003eUses the factory brackets, hangers and mounting points\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: Dinan\u003c\/li\u003e\n\u003cli\u003ePart Number: D660-0050\u003c\/li\u003e\n\u003cli\u003eProduct Type: Axle-back exhaust\u003c\/li\u003e\n\u003cli\u003eMaterial: T304 stainless steel\u003c\/li\u003e\n\u003cli\u003eTips: Four 3.5 inch, polished, laser engraved\u003c\/li\u003e\n\u003cli\u003ePower Gain: +5 hp (Dinan rating)\u003c\/li\u003e\n\u003cli\u003eWeight Savings: 3 lbs vs stock\u003c\/li\u003e\n\u003cli\u003eEmissions: 50-state legal, does not affect vehicle emissions\u003c\/li\u003e\n\u003cli\u003eLabor Time: 1.8 hours (Dinan estimate)\u003c\/li\u003e\n\u003cli\u003eChassis: F80 M3, F82 M4, F83 M4\u003c\/li\u003e\n\u003cli\u003eEngine: S55\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eVehicle Fitment\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eConfirmed fitment for the following vehicles:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBMW F80 M3 Sedan (2015-2018)\u003c\/li\u003e\n\u003cli\u003eBMW F82 M4 Coupe (2015-2020), including M4 CS (2019-2020) and M4 GTS (2016)\u003c\/li\u003e\n\u003cli\u003eBMW F83 M4 Convertible (2015-2020)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot for the G80 M3 or G82 M4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eEmissions and Legality\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDinan classifies this axle-back as legal for sale and use on emissions controlled vehicles in all 50 states because it does not affect vehicle emissions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDinan estimates 1.8 hours of labor. The system hangs on the factory hangers and mounting points and reuses your factory valve actuators. A lift makes the job much easier, and Dinan's installation instructions cover every step.\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eLet the exhaust cool completely and raise the car on a lift or secure jack stands.\u003c\/li\u003e\n\u003cli\u003eUnplug the factory valve actuators and remove the factory rear mufflers as described in Dinan's instructions.\u003c\/li\u003e\n\u003cli\u003eHang the Dinan system on the factory hangers and reinstall the factory valve actuators.\u003c\/li\u003e\n\u003cli\u003eAlign the tips in the rear valance, tighten all clamps and check for leaks and clearance.\u003c\/li\u003e\n\u003cli\u003eConfirm the valves respond to your M Drive exhaust setting before driving.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Dinan","offers":[{"title":"Default Title","offer_id":51946717348086,"sku":"DNND660-0050","price":2113.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2674\/6278\/files\/21a594a488b137f632b2683caa8aefc0L.jpg?v=1792170265","url":"https:\/\/autotecknic.com\/products\/dinan-free-flow-axleback-exhaust-polished-tips-bmw-f8x-m3-m4","provider":"AutoTecknic USA","version":"1.0","type":"link"}