For F90 M5 and F92 M8 owners chasing a proper stage 2 upgrade-no CEL, no coding, no mid-pipe add-ons-these Active Autowerke 11-063 downpipes deliver real flow gains on the S63TU.
Bolt-on fit for F90, F91, F92, F93-V-band inlet, full 304 stainless, TIG welded, includes lower section (not just ‘downpipe only’)
OBD2-compliant GESI G-Sport Ultra cats-4.5" high-flow substrate, EPA-registered, 49-state legal, zero check engine lights on stock or stage 1 maps
Track-day ready but daily-driver friendly-rated to 850 hp, handles 1500°F, spools faster, cleans up mid-range torque without drone or rasp
Search terms covered: F90 downpipes, F92 M8 exhaust upgrade, S63 stage 2, catted downpipes no CEL, fast road S63, track day M5, GESI downpipes UK, B58 not applicable-this is S63 only
