are you mechanically handy yourself ? do you have the space to do a conversion ?
if so then cost of halfcut 2-5k (depending on model/specs)
then add a couple of grand for the misc bits plus your time..
if you want to just drive in/ drive out of a workshop id budget the above plus a coupld of grand in labour... so say 9k pretty eaisly all up. if your going to do it id strongly suggest getting the 3rd gen 3sgte as they are a significantly better enigne. lots of small improvments that arnt just bolt on items.
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