It began as a stock, dealer-owned 525i wagon acquired from a charity auction. Omar’s initial plan was direct: an S52 engine swap. For a few years, he used it as a daily driver, running long-tube headers and a 3.5" MAF.
An early setup pairing a Holset HX40 Super turbocharger with stock S52 internals proved that factory ringlands have their limits under forced induction.
For the current configuration, Omar chose to build it without compromise. The foundation is an 86.5mm bore block built with JE Pistons, Carrillo rods, ARP main studs, and ARP 625+ head studs. The top end utilizes a non-VANOS M50 cylinder head, modified with a 5150 7mm valve conversion kit. Forced induction is delivered via a BorgWarner S366SX-E turbocharger with a TiAL exhaust housing, feeding a custom 4-inch downpipe and a full 3.5-inch exhaust system fabricated by SpecFab in San Diego, California.
Power is channeled through a ClutchMasters 850 Strapped twin-disc clutch, mated to a 6-speed ZF GS6-53BZ transmission from an E9X 335i.
While the exterior currently wears a rough appearance, the foundation is completely intact. The wagon sits with a full M-Sport body kit and authentic E34 M5 sport seats. A final coat of British Racing Green is next on Omar's list.
But he prides himself in sorting every mechanical detail first. The cosmetics can wait until the mechanical work is complete.