Ive had a superchip in one of my rs2k but had alot of problems with it car not starting right etc..they also can be slightly mapped for different mods ive been told.

Have a collins powerchip in mine at the mo and its been fine..and work very well with other mods i have..

Check ya ecu for a code. ring collins up order it your get it next day and plug it in easy to do..