245/35-20 is 12.25mm (3.7%) taller than OEM. Those tires should make the actual speed is about 4% faster than the speedo read. The spacers are 7075 Aluminum Alloy CNC custom made.
It is not easy to remove and reassemble the rubber, but worth a try. The three of us install the Milltek exhaust together at the end of January, two of us experienced the rattle and can be fixed in that way.