Performance Tuning for MS41. Please select your configuration above or contact us for a custom configuration. Setup 1 - Swap tune - EWS, EVAP, SAP, CAT off for use in race cars / off road. Perfect tune for your engine swap. Setup 2 - Performance Tune - Optimized factory tune for the most performance available in a competely stock configuration. EWS / EVAP / SAP / CAT are left factory. Only performance improvements are made. Most cars will see 5-10whp peak gains but 18-25wtq gains in the mid range. Swapping the OBD1 manifold out for an OBD1 M50 manifold will bring about much better gains up top with peak hp. Setup 3 - Performance Swap Tune - Performance tune and swap tune combined. Setup 4 - Supercharger / Turbo Charger Performance Tune - Same as setup 3 but for boosted applications. Using 803 or Hitachi Mass air flow sensors and 41 or 60 lb injector sizes. Contact us with your specific build details when ordering.