Katie:

Those are all great questions that a lot of us would like to know. Eracer76 will probably be the most qualified to discuss your questions because he just sent his ECU to RENNtech and is waiting to install the ECU upgrade and new crank pulley. The last car I could actually work on, and know what I was doing, was my 1970 TR6...so I really can't answer your questions with any authority...but I am anxiously waiting to see what Eracer76 has to say about the RENNtech performance package.