i have the 96 rs sti tuned model also badged as the rfrb ..run fast run bold /it has the ej20r /the ej20r has shortened sleved pistons and has molybedium coating on the piston and cylinder allowing for higher temp running and less friction the shortened sleved pistons are to allow for extreme revving /ej20h etc have standard piston skirts and no coatings the rfrb also had a stage 2 sti manual gearbox and heaps of other parts a mod chip included which differs from standard rs gt types ,the ej20r is the race build engine