The build of this Audi began as a 100% stock B5 S4 Imola avant, which we used to demonstrate our philosophy of ZERO to HERO. The vehicle features a fully built engine with 81.5MM Mahle Motorsport Forged Pistons, forged H beam connecting rods, our own 2.8L 30V CNC cylinder heads, Ferrea complete valve train, OEM Audi RS4 throttle body & intake manifold as well as Tial's R770 turbochargers !