the roush numbers are rear wheel and FP are not.The Ford performance tune out performs it for half the price with a warranty that Des not void factory. Kind of a nobrainer to me. The numbers on that tune are not peak.
The FP numbers are still higher. If you calculate the approximate 12% drivetrain loss from the FP Flywheel numbers or 100 HP gain and 70 tq, you still end up with 88 RWHP and 61 ft/lb RWTQ gain compared to Roush's 60 RWHP and 51 ft/lb RWTQ.the roush numbers are rear wheel and FP are not.
ford claims HP up to 335 and torque at 390.the 100HP gain is at 6000rpm and not applicable to the roush numbers.use the 335/390 to compare.The FP numbers are still higher. If you calculate the approximate 12% drivetrain loss from the FP Flywheel numbers or 100 HP gain and 70 tq, you still end up with 88 RWHP and 61 ft/lb RWTQ gain compared to Roush's 60 RWHP and 51 ft/lb RWTQ.