all 01's i thought were the same, i thought 01. 5 only meant that you had rear disc brakes as opposed to drums.
i love my DDP injectors, they have been great. they are the stage 4 (150hp rated) and i made nearly 180hp AT THE WHEELS over stock with only the injectors and a larger turbo to supply plenty of air. i am soon switching to something bigger, most likely mach 6's unless lenny is now making a 200+hp injector.