Performance upgrades for the S55-powered BMW M3 (F80) and M4 (F82). Heat-shielded catless downpipes and front-mount intake hardware built to wake up the twin-turbo inline-six. Exactly the supporting mods a Stage 2 tune wants.
Custom Stage 1 & 2 ECU calibrations for the S55 are available on request: dyno-proven maps tuned to your fuel and hardware, with lifetime revisions. Get in touch to spec your build.
