Anybody used one of these before, what does it do. I am looking for a stack, thanks

 

It is a pressure box. I have been running the stage 2 for about 2 years now.

 

Its not just a pressure box it has a fuel economy mode which is mainly timing and 10 available power levels the upper # levels 7-10 or HO have added timing. It also has an adjustable rail pressure feature and rail pressure guage yes the power level selection does up the rail pressure but it also gives you the option to up the rail pressure up to 10k psi or lowere the pressure down -2k psi. Box also has a boost guage built in and a anti theft mode which is activated by holding the mode button down. I have had a SP Diesel stg 3 module for about a year and a half had it on my 03 for a year or so and was the best box by far ever installed on it and i tried them all. I am trying to get it updated by sp to fit my 07 but they have a problem with answering the phone and only reply to emails sometimes.

 

I used the stg 2 box for awhile, it was ok by itself I guess. The control box was too small, unless you have little girly hands, the directions were clear as mud as to what the different settings did, and NOBODY at SP was willing to tell me what the box did so I could stack it w/ confidence. They cut their own throat w/ me, I will not go back! "Hey try this new box, but you have to guess what it does and hopefully you dont blow up your truck!" Idiots IMO

 

SP Diesel has been banned from this forum for a bevy of reasons. My opinion would be to run not walk in the other direction .