So im going to be using the stock 01 ecu and harness. Stock 03/04 maf and injectors. Local tuner is telling me that the 01 ecu is "50% slower" vs the 03/04 ecu which he says could be an issue at higher levels. I've seen many people use the 01 ecu without any problems. Converting to the 03/04 ecu and harness is quite expensive and more work than I care to undertake unless I have to. Am I stuck having to use SCT products? Assuming I keep the 01 ecu I'm looking at $700 to tune the car which just seems a touch on the steep side to me. That's not including the $400 sct device needed either!