{"product_id":"active-autowerke-bmw-m3-m4-f80-f82-f83-equal-length-midpipe","title":"Active Autowerke BMW M3\/M4 (F80\/F82\/F83) Equal Length Midpipe","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eAn inline-6 engine naturally produces evenly spaced exhaust pulses, giving that smooth, full sound enthusiasts expect. But the S55's twin-turbo layout, split across unequal-length front and rear bank downpipes, disrupts that rhythm, producing a sound that comes across more like two independent inline-3s competing for attention than a proper 6-cylinder growl. Active Autowerke's Equal Length Midpipe was developed specifically to correct this at the source, a patented design (US Patent 11248511) that remains the definitive alternative to their own world-famous single midpipe.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eRather than rebuilding the rear exhaust section to equalise pipe length, which would force every owner into a completely new rear system, Active Autowerke's R\u0026amp;D added length specifically to the passenger-side midpipe section and engineered a new crossover using sinusoidal pipes to correct the downpipe length variance before the two sides mix. The result is a genuinely different exhaust character from the typical \"S55 sound,\" closer to the smooth, throaty note a 6-cylinder sports car should have. This Gen 2 version introduces specially developed resonators, engineered to remove rasp and reduce the unwanted 2,000rpm buzzing some owners experience, for a noticeably smoother, deeper, and more refined tone than the original Gen 1 design it replaces. The system includes the Active Autowerke F-brace and is engineered for precise fitment.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eWorks with:\u003c\/strong\u003e Stock or Active Autowerke downpipes and rear exhaust systems. Fitment and sound results are only validated with these combinations, compatibility with other exhaust brands isn't guaranteed. Vehicles fitted with M Performance Exhaust (MPE) or CS exhaust should strongly consider the resonated version.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"mt-2 -mb-1 text-base font-bold\"\u003eWhy Choose This Equal Length Midpipe\u003c\/h2\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePatented design (US Patent 11248511) that genuinely corrects the S55's uneven exhaust pulse\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eGen 2 resonators reduce rasp and 2,000rpm buzzing versus the original Gen 1 design\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDelivers a smoother, deeper, more refined 6-cylinder tone, not the typical \"S55 sound\"\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eIncludes the Active Autowerke F-brace as standard\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLighter than the factory system with quicker turbo spool\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eIncreased low-end and mid-range power from improved exhaust flow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"mt-2 -mb-1 text-base font-bold\"\u003eCompatibility\u003c\/h2\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBMW F80 M3\/M3 CS (S55, 2015+)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBMW F82\/F83 M4\/M4 CS (S55, 2015+)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e if you're running catless (straight-through) downpipes, the resonated version is strongly recommended.\u003c\/p\u003e\n\u003csection class=\"shopify-section section\" id=\"shopify-section-template--23383691428165__main\"\u003e\n\u003cdiv class=\"page-width\"\u003e\n\u003cdiv class=\"product product--small product--left product--thumbnail_slider product--mobile-show grid grid--1-col grid--2-col-tablet\"\u003e\n\u003cdiv class=\"product__info-wrapper grid__item product__info-wrapper--extra-padding scroll-trigger animate--slide-in\"\u003e\n\u003csection class=\"product__info-container product__column-sticky\" id=\"ProductInfo-template--23383691428165__main\"\u003e\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"Active Autowerke","offers":[{"title":"Gen 2 - Non Resonated","offer_id":54423746806093,"sku":"AAW-MPS-S55-004","price":1692.73,"currency_code":"EUR","in_stock":false},{"title":"Gen 2 - Resonated","offer_id":54423746838861,"sku":"AAW-MPS-S55-004","price":1946.83,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0980\/4808\/2253\/files\/Active-Autowerke-BMW-m3-f80-m4-f82-f83-equal-length-midpipe.jpg?v=1785350333","url":"https:\/\/i6tuning.com\/products\/active-autowerke-bmw-m3-m4-f80-f82-f83-equal-length-midpipe","provider":"i6 Tuning","version":"1.0","type":"link"}