{"product_id":"aa-midpipe-s55-equal-length","title":"Active Autowerke Equal-Length Mid-Pipe — S55","description":"\u003cp\u003e\u003cstrong\u003eActive Autowerke equal-length mid-pipe for the S55 — F80 M3, F82\/F83 M4.\u003c\/strong\u003e The S55's factory down-pipe lengths differ between banks by nearly a foot and a half, spacing the exhaust pulses unevenly — the root of the rasp. This corrects it.\u003c\/p\u003e\n\u003ch3\u003eThe design\u003c\/h3\u003e\n\u003cp\u003eA patented equal-length design (US 11,248,511; EU\/UK 3,882,441) that matches both banks for a smooth, cohesive straight-six tone. This is the Gen 2 (it replaced the original, no longer made) with resonators that strip the rasp and cut the 2,000-rpm drone. 304 stainless, and it includes Active Autowerke's F-brace to restore tunnel rigidity once the factory mid-section is out.\u003c\/p\u003e\n\u003ch3\u003eWhere it fits\u003c\/h3\u003e\n\u003cp\u003eSits between the S55 downpipes and the rear exhaust. Off-road \/ race use only.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eBMW S55 — F80 M3, F82 M4, F83 M4 Convertible. (F87 M2 Competition uses a separate mid-pipe.) Confirm your chassis in the selector.\u003c\/p\u003e","brand":"Active Autowerke","offers":[{"title":"Default Title","offer_id":43280709877821,"sku":"AA-MP-S55-EL","price":1915.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/Gemini_Generated_Image_swyrupswyrupswyr.png?v=1781742887","url":"https:\/\/essewerks.com\/products\/aa-midpipe-s55-equal-length","provider":"Esse Werks","version":"1.0","type":"link"}