I understand the concept of stages one and so forth. I purchased a 93TT as is. I have the following that i can visually see: larger inner coolers, Profec boost controller, Apex II Airflow controller, and Stillen exhuast without cats. I was inform the following items were upgraded as well: Racing clutch, upgraded ECU chip the injectors are not know. Can anyone tell me what stage I am may be setting at?