The timeless lines of the E46 integrate perfectly with the M3 coupe additions, like the power bulge on the hood, M wheels and mirrors, the side fender vents, and the quad-exit tailpipes.
As per the listing on Car & Classic, this wasn’t a half-hearted conversion. The original 320i SE’s engine, suspension, drivetrain, and interior were substituted for M3 coupe replacement parts sourced from a damaged M3. Even the arches, bumpers, and front wings were replaced with the more aggressive items from the M3. Inside, there is a full M3 interior, including wiring.