[ktllc15]

To convert to a 6nz you need, 6nz 70pin ecm, engine wiring harness or repin 120 pin harness to 70 pin and I believe you also need to change cam position sensor which requires drilling and tapping a new hole. Doing this deletes the iva's which if you're still running the stock 18:1 pistons will lead to high cylinder pressures and if run hard will lead to head gasket problems. You definitely do not want to lug it with the iva's deleted.

It's no small project to do it right.