This Mercedes GLC63S  came in for a Stage 1 Custom Dyno Tune  on completely stock hardware — no performance mods needed. What We Did: Stage 1 Custom Dyno Tune  – optimized engine mapping for maximum output D Service & Inspection  – full check-over for peace of mind Dyno Results: Stock:  280 AWKW After Stage 1 Tune:  370+ AWKW With the 4MATIC transmission , this upgrade delivered impressive power gains and smooth drivability , leaving the customer with a big smile  on his face