I'm going to do the Old Twins program. I guess it's a little different then the new twins program. Should have my unit back on Thurs. (gotta love Fed-ex overnight) My question to any of you is have you tried it and what is the noticable driving difference between the standard program and the old twins? I know the old twins program will start adding fuel at 3psi and have full fuel by 12psi or so. Where as the new twins I think it starts at 3 an goes to 20 (not sure). I do know that the standard one doesn't start fueling until 12psi. That's why I'm going this route. To get rid of that lag between 0-12psi. Also, how much more or less is this program going to smoke (think CA). Thoughts/experiences?