Girodisc BMW G8X Iron Conversion Rear Replacement Rings AUDI_S4_B9 *Largest gains are measured as

*Largest gains are measured as the largest gain at any single point between the two plots

it does not provide nearly that much in the lower rpm range where most quicker-spooling setups see peak power numbers

All threaded holes are tapped to the industry-standard 1/4"-28 thread using the standard 6x10 bolt pattern

2006-2010 VW Jetta Mk5 2

Complete Maintenance Solution: Includes a specially formulated cleaning solution and high-quality filter oil to effectively remove contaminants and restore filter performance

Girodisc BMW G8X Iron Conversion Rear Replacement Rings AUDI_S4_B9 *Largest gains are measured asNote: These rings are for the iron conversion rear rotors, part number A2 322. Our replacement rings are sold in pairs and include replacement hardware. The only parts you will reuse are your existing GiroDisc hats. Please note that unless specifically noted, GiroDisc replacement rings are only designed to work with GiroDisc hats. They are not designed to be used with other brands, including hats from cars equipped with 2 piece rotors from the factory.