i have a 96 dually--3. 54 auto/trans and have the dr perf phaze 3 setup. this is a 4 hour installation and thats it--no other messing around--no readjustments but you had better have a beefy trans. I question the price difference between the phaze 2 at 1995. 00 and the phaze 3 at 2995. 00 considering the cost to manufacture both systems has to be pretty much the same. performance before upgrade was 0 to 60 in 14. 9 sec and after 8. 0 seconds but the best power is from 50 to 80 mph. pulling a 14000# trailer doesn,t slow down for the hills anymore. mileage remained the same