For S58-powered BMWs that have outgrown stock boost: this CTS Turbo Stage 2+ kit delivers repeatable 825-900whp on pump or E85, with factory-mounting geometry and no core swap.
Fitment exact: G80 M3, G82 M4, G87 M2, F97 X3M, F98 X4M (2019-2023) - no adapters, no flange mods
Stage 2+ means: larger compressor wheel + ported shroud, reinforced turbine housing, VSR-balanced to <0.1mm/s, upgraded thrust system for track-day durability
Not a decat or fast-road bolt-on: requires supporting mods - full exhaust, charge pipe, intercooler, and professional S58-specific tuning (no ISTA+ wastegate calibration needed on post-2021 ECUs)
Search terms covered: S58 turbo upgrade, G82 M4 stage 2, G80 M3 track day turbo, G87 M2 fast road turbo, F97 X3M decat turbo, S58 show car turbo, S58 daily driver upgrade
