[2.2 Straight six]

I've seen it done before by friends who work at a custom fabrication shop. But usually the car needs a full roll cage, seal welding and the cage has to be tied into the strut towers and firewall and stuff. Not a small job by any means.

A friend has converted his Volvo V40 to 4-wheel drive, there's no roll cage but it has a hell of a lot of chassis bracing. it's entirely seam welded, has subframe connectors, strut braces (that also go to the firewalls) and a great deal of other welding and bracing.