Girodisc Alfa Romeo Giulia, Stelvio Quadrifoglio Rear Iron Rotor Conversion TOYOTA_ZN6 The stock 54mm pipe is

The stock 54mm pipe is a recognised restriction in the factory exhaust system

2000-2006 BMW E46 M3

and debris

Fittings: 8AN

eliminating the spring-rate compromise of push-type valves

Girodisc Alfa Romeo Giulia, Stelvio Quadrifoglio Rear Iron Rotor Conversion TOYOTA_ZN6 The stock 54mm pipe isThe Girodisc system is a direct replacement for the OE disc. No modifications are necessary. The disc will bolt directly to the car and work with OE calipers perfectly. The central hat section of our rotor is made from strictly U. S. sourced 6061 T6 aircraft specification aluminum. The disc is made from our own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved vane design,