in a addition of retro or classic this year i saw a volvo t5 2.3 turbo lump (also found in focus RS) in a mk1 looked a bit of a squeeze as its a 5 cylinder where as a 4 cylinder will fit with intercooler and rad without cutting the bulkhead out. vaux 2.0 LET is turbo my bro is into vaux an is converting his XE into LET is much cheaper than cossie what about a zetec turbo convertion not sure about price never looked but its been done loads of time if your willing to cut the bulkhead ever considered skyline its a big lump but good power from the off