CNC machined from 6061 T6 aluminum bar stock.The first change is a setback Fuel injector hat, covering 75 percent of the rotors vs 25 percent. The upper or lower spacer can be plumbed to accept injector nozzles. The rear entry cover/opening is elevated and increased volume and allows for quick inspection and lubrication. In addition Darkside racing added 6 extras fasteners to secure the mounting. Lastly all sealing surfaces are o-ringed | |