The B21FT was used in 200 series cars from 1981-1985, this engine produced 127 HP@5400RPM and had comp. ratio of 7.5-1. In its interccoled form (standard 1984-85) it produced 162 HP@5100RPM and still had comp. ratio 7.5-1. The B23FT was only used in 1984, and only in the 760 turbo. It produced 157 HP@5300RPM and had comp. ratio of 8.7-1. The B230FT has had many variations from 1985-95. From 85-89 this engine only came with intercooler and produced 160 HP@5300RPM and had comp. ratio of 8.7-1. There was also a dealer installed option available called the "Turbo+ kit" which boosted HP to 175@5400RPM.