if you buy an expensive st, then buy a cheap snotter of a 1.6, you've still got the st shell you can flog on ebay and the 1.6 snotter bits you can weigh in, if you take a week to reshell the car it's going to save you money in the long term ins't it
and if you need any thing for the st you just give ford the reg number and sorted
alternativly, bolt in a massive 9 litre muscle car V8 and rwd a prius, that'll get the lentilists going banana's