So if the heat shield has been removed, that's a really bad sign? I just recently bought an 06 STI and I originally thought it was stock, but now that I have given it a once over in my garage and at a dealership I found out that it has been modded and returned to as close as stock as possible. Car had a clean carfax and autocheck and was purchased from a reputable dealership as well. Any other bad signs to look for other than the brakes, heat shield etc? Is it possible to tell by myself if the ECU has been flashed?