It does not matter what they claim, the only way to know exactly what you are running is by, getting on a Dyno, cars are different so the numbers are not always the same. But both those Tuners are excellant, and either way you go, it's going to be good. I believe the SCT, is a little more versitile though. I have both Tuners, SCT on my Stang and Diablosport on the wife's Camaro.
07 GT SCT: CUSTOM TUNE by "MUSTANG SPECIALTIES". STEEDA: CARBON FIBER HIGHFLOW CAI. STEEDA: 1 PIECE ALUMINUM DRIVESHAFT. FRPP: 4.10 GEARS. MAGNAFLOW: AGGRESSIVE 3" 409 STAINLESS STEEL DUAL EXHAUST. BBK: LT 304 STAINLESS STEEL HEADERS, BBK: o/r X-PIPE. MSD: BLASTER PERFORMANCE COIL PACKS. POWERSTOP: CROSS DRILLED SLOTTED ROTORS. WHEELS: STAGGERED WHL 22X8.5F-22X10R.