Ah Ken, the look of the bike is what drew me to it, they are futuristic, full of angles and sharp lines, not like these curvy bubbley bikes that are being spewed out nowadays, same with cars tbh.
Basically, the turbos were added to smaller capacity bikes in an attempt to rival the performance of 1000cc-ish bikes, but they were overengineered, expensive to buy, heavy and never did perform aswell as the larger bikes, people just didnt want to buy them and in the XJs' case production lasted from 1982-1985