we are all bias about our cars mate but think you will struggle with that price. sorry, cars not fetching anything at the moment i would sit on it a while
i agree with the rest fuel cuty off if you change turbo you will need re map and your ecu is not mappable so get z4 and replace turbo with similar you should be ok with that
yes mate spoke to them today and can be done ok but recomend get drive shafts to match will see a big difference in power to weight so that much bhp will be better