{"product_id":"aa-downpipes-s63-f90","title":"Active Autowerke Downpipes — S63 (F90 M5\/M8, F95 X5M, F96 X6M)","description":"\u003cp\u003e\u003cstrong\u003eActive Autowerke GESI-catted downpipes for the S63TU — F90 M5\/M8, F95 X5 M, F96 X6 M.\u003c\/strong\u003e Opens the twin-turbo V8's gating restriction while keeping high-flow cats in the pipes.\u003c\/p\u003e\n\u003ch3\u003eConstruction\u003c\/h3\u003e\n\u003cp\u003eBuilt in-house from 304 stainless, TIG-welded, with a factory-matched 3.5\" V-band inlet tapering into a mandrel-bent body — and the lower section others sell separately as a mid-pipe is included. Routed to retain the OEM O2 heat shield, so the bay stays factory-clean. A pair of 4.5\" GESI G-Sport Ultra High Output catalytic converters — EPA-registered, 49-state \/ OBD2, no CEL. Not California-legal.\u003c\/p\u003e\n\u003ch3\u003eWhere it fits in the build\u003c\/h3\u003e\n\u003cp\u003eDownpipe-side core of an S63 Stage 2 build; we tune around it. The \u003ca href=\"\/products\/stage-2-kit-s63\"\u003eStage 2 Kit — S63\u003c\/a\u003e bundles parts + calibration for 8% under à la carte.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eBMW S63TU — F90 M5\/M8, F95 X5 M, F96 X6 M. Confirm your chassis in the selector.\u003c\/p\u003e","brand":"Active Autowerke","offers":[{"title":"Catted (GESI)","offer_id":43280709779517,"sku":"11-063","price":3485.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/Active_Autowerke_Downpipes_01.webp?v=1781743119","url":"https:\/\/essewerks.com\/products\/aa-downpipes-s63-f90","provider":"Esse Werks","version":"1.0","type":"link"}