The ramifier is the one box I have the least experience with. It appears to me to be similar to the PDQ volumizer, in that both use fancy boost fooling to enhance fuel delivery (this causes the ECM to dial up additional duration and timing because it sees high boost levels). TS uses this technique in support of the statement that rail pressures stay below 26,000 PSI even at 100 peak-to-peak horspower at the rear wheels, something the volumizer was unable to do in my tests. The power output, drivability, etc. of the Ramifier is well chronicled and I don't know of any unhappy users. I just am not able to speak to the 26,000 PSI rail pressure claim because I havent tested the box.