RDSport has unveiled its M3 program, named RS46. RDsport states that ‘the RS46 is truly the motor that BMW should have installed in the M3 in the first place’. The tuner has reworked the engine internals and included larger, forged, light-weight, aluminum pistons, forged, billet connecting rods and new billet crankshaft with a longer stroke. All of these parts equate to a larger displacement 4.6 liter motor, up from the factory 4.0 liter.
Also included in the build is a complete exhaust including; race, tubular headers with F1-style merge collectors, metal-matrix, sport, catalytic converters, X-Flow downpipe and sport silencers all built from stainless steel.