I bought a LS5.3 dropout and cut down the harness to standalone. The dropout came with a 411 ecu and I think it was out of a 2001 suburban but am not sure. If I buy a MPI2 tuner and use HP tuners do I have to know anything other than what I listed in order to buy credits to modify my tune, (turn off vats, delete rear O2's and such)?

Thanks in advance,

Newbee.....