C300 / GLC300 / E300 M274 Turbo Performance Upgrades

Bolt-on performance upgrades designed specifically for Mercedes-Benz models equipped with the M274 2.0L turbo, including C300, GLC300, E300, and SLC300. Start with simple airflow + boost-control improvements, then step up to exhaust flow upgrades when you’re ready.

Typical Upgrade Path — M274 Platform

  • Drop-in high-flow air filters: modest airflow gains with OEM-style fitment.
  • Diverter valve upgrades: improved boost control during acceleration and gear changes.
  • Catless downpipes: reduced exhaust restriction and improved turbo response (bigger step).
  • ECU Tuning: Recalibrates engine management to extract meaningful gains beyond bolt-on hardware.

Fitment & Use Notes

  • Verified platforms: C300, GLC300, E300, and SLC300 equipped with the M274 engine.
  • Use disclaimer: catless downpipes are intended for off-road or competition use only. Buyer is responsible for emissions compliance.
  • Support: VIN-based fitment confirmation available prior to purchase.