im turboing my stock b18b1 with a t3 60 trim and a performance shop told me i needed to change to an OBD1 ecu to have it chipped and tuned. they said i wont need a msd 6btm to retard timing and wont need a S-AFC because the chip programming will do what these things do. is this true or do i need them. also what psi can i safely run and what size injectors should i use.