Anything is do-able, Except make a 2.1 into anything bigger, Not for the fact that it can't be done but the cost effectiveness of doing it.... First and foremost 2.5 and 3.0 are AWD, 2.1 isn't, T box, rear diff, propshaft, rear hubs and driveshafts, Cable accelerator on the 2.1, etc etc, the list goes on, All these differences and considerations make it an unrealistic option, Sorry,