The revision is in the form of a material change based on the original that is lighter

and eliminates sling

60 supercharger pulley will spin the charger at 38

Carpy2 on BimmerForums did a great video tutorial on installing this strut kit

and properly balanced as one part

Ferrari 512/Testarossa - FreeFlow Exhaust w Silencer Spare Adapters (EU spec) S52 Manifold The revision is in theDemand the Best. Demand Capristo. Capristo Exhaust Systems are engineered and manufactured exclusively at our factory in Sundern, Germany, utilizing advanced 3D laser scanning, CAD design, digital prototyping, and CNC bending milling. Technical Highlights: 100% Made in Sundern, Germany Highest Grade T309 (1. 4828) Stainless Steel Patented Reinforced Design to Eliminate Resonance Manually TIG Welded by Capristo Craftsmen Hand Polished to a Mirror