Add to Cart Quaife Fiat Barchetta Quaife Atb Helical Lsd Differential, Qdh2K-22 $1,301.27 Quaife ATB Helical LSD differential for the Fiat Barchetta is a direct replacement for the standard Fiat Barchetta open differential. The Quaife ATB Helical LSD differential transforms your car’s performance. Unlike a conventional plate-style... $1,301.27 Add to Cart