The ROUSH RHD, (Right Hand Drive), modification kit for the R2300 Phase 1 and R2300 Phase 2 systems, part numbers 421823 and 422001 respectively, allows owners of RHD Mustang GT's the ability to infuse their Mustangs with up to 727 horsepower. This kit is only needed for RHD Mustangs, and only contains the additional parts needed to install the ROUSH R2300 on factory RHD built Mustangs.
