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GarageScout Take

S54 3.2-liter inline-six, installed in 2020 and managed by an updated E46 M3 MSS54HP DME with RK-Tunes software. Castro Motorsport performed the rod-bearing service, oil-pump nut tack-weld, VANOS-line and engine-mount installation at 112,408 miles in November 2025, then installed and calibrated the Turner Motorsport CSL-style intake in February 2026.

Strengths

  • S54-powered slicktop configuration
  • Documented Castro Motorsport engine and chassis work
  • BBS LM wheels with Michelin Pilot Sport 4S tires
  • Accident-free Carfax report

Watch For

  • Engine swap has not been inspected by the California Bureau of Automotive Repair
  • Has not passed a California smog test
  • Repainted in 2005 for cosmetic reasons
  • Montana-titled and located in California