{"product_id":"mad-g8x-s58-axleback-exhaust-bmw-m3-m4-g80-g82","title":"MAD G8X S58 Axleback Exhaust – BMW M3 \/ M4 (G80\/G82)","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eIn Stock:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Ships in 1-2 business days\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eAvailable to Order:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Ships in 3-4 Weeks\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eLooking to give your G8X a deeper, more aggressive exhaust note while retaining full valve functionality?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe factory axle-back keeps the S58 relatively subdued and leaves plenty of room for improvement in both sound and exhaust flow.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe MAD Axle-Back Exhaust replaces the restrictive factory rear section with a larger 76mm T304 stainless steel system, delivering a deeper exhaust note, improved flow, and significantly more character when the valves open.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDeeper tone.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFull valve functionality.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eOEM+ fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhy this Axle-Back\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe axle-back plays a major role in determining how your G8X sounds — especially when paired with an upgraded midpipe.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMAD increases the tubing diameter from the factory 70mm to 76mm, helping reduce backpressure and allowing exhaust gases to flow more efficiently. MAD reports gains of up to +5 HP and +5 lb-ft of torque while improving throttle response.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe valved design retains the factory exhaust valve actuators, allowing the system to remain deeper and more controlled during normal driving while opening up to a much more aggressive exhaust note under load.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt can be paired with the factory midpipe or combined with the MAD Resonated Single Midpipe for a complete exhaust setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eLarger 76mm piping.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFactory valve integration.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eDesigned specifically for the S58.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Overview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• Directly compatible with the MAD Single Midpipe with no cutting required\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Can be connected to the factory midpipe with cutting required\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Retains factory exhaust valve actuators\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Extended valve harness included\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Includes necessary mounting hardware\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Professional installation recommended\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eFitment\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBMW G8X Platform:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• G80 M3\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• G81 M3 Touring\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• G82 M4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• G83 M4 Convertible\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCompatible with the factory midpipe and MAD Single Midpipe configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003ePerformance \u0026amp; Sound\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• Deeper and more aggressive exhaust tone\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• 76mm tubing compared to the factory 70mm system\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Reduced exhaust backpressure\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Improved exhaust flow\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Up to +5 HP and +5 lb-ft of torque claimed by MAD\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Valved design for greater control over exhaust volume\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Drone-abatement design helps reduce unwanted cabin resonance\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Approximately 7 lbs lighter than the factory axle-back\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFactory Axle-Back: approximately 44 lbs\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMAD Axle-Back: approximately 37 lbs\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eConstruction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• 100% T304 Stainless Steel\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• 76mm Exhaust Tubing\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• TIG-Welded Construction\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Brushed Stainless Finish\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Quad Clamp-On Exhaust Tips\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Designed for Factory Exhaust Cut-Outs\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Corrosion-Resistant Construction\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eExhaust Tip Options\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• Quad 4” (100mm) Silver Tips\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Quad 4.5” (114mm) Black \/ Carbon Tips\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat's Included\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• MAD G8X S58 Axle-Back Exhaust\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Four Exhaust Tips\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Extended Valve Harness\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Required Mounting Hardware\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWarranty \u0026amp; Returns\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e• Eligible for a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e90-day return window\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e if unused, uninstalled, and in original condition\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Backed by a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elifetime warranty on defects and fitment\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e⸻\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eAutomaz Approved\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIf you want more sound out of your G8X without giving up the functionality of the factory exhaust valves, the MAD Axle-Back is a great way to complete the rear section of the exhaust.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe larger 76mm piping improves flow while the valved design gives you the flexibility to keep the car more controlled during normal driving and let the S58 open up when you want to hear it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePair it with the MAD Resonated Single Midpipe for a complete setup designed to deliver the deep, bassy S58 exhaust note these cars are capable of.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/HFrPLnqeY-o?si=NotO5AEJJa6CIuru\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"Automaz Collective","offers":[{"title":"Brushed 4 inch","offer_id":43993448841275,"sku":null,"price":999.0,"currency_code":"USD","in_stock":true},{"title":"Black 4.5 inch","offer_id":43993448874043,"sku":null,"price":1099.0,"currency_code":"USD","in_stock":true},{"title":"Carbon 4.5 inch","offer_id":43993448906811,"sku":null,"price":1099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/5388\/1403\/files\/IMG_1825.jpg?v=1786924136","url":"https:\/\/automazcollective.com\/products\/mad-g8x-s58-axleback-exhaust-bmw-m3-m4-g80-g82","provider":"Automaz Collective","version":"1.0","type":"link"}