The engine used previously is the B4204T3, can I change this with minimal issues to a B4204T5 or even better a new model e drive T6 twin turbo or new T6 single turbo or even the new T5 single turbo? Am happy to change the gearbox too (current.one not in great shape), but reluctant to change the cabling attached to current motor which my mechanic says is not possible as messes with the auto gear changing, abs etc.
Also as a bonus how can I modify these engines if I want more power out of them
