I have raced 2 ecoboosts. One was stock, the other was tuned with intake, and catback ( Stage 3 Motorsports - Phase 2 kit). Both had 3.73's. I have 3.55's with a 6spd (20 inch wheels), with a rev-c Hemifever tune.
The stock ecoboost got me by a fender on a dig, and I pulled on him at 40mph and took a 2 truck lead to 100mph. 35mph roll i pulled 2 trucks and held to 100mph. these races were duplicated twice to ensure consistency.
The modded ecoboost from a dig launched like holy **** balls.. jumped a truck and a half on me and i slowly was reeling him in, but after 65-70mph I reeled him in like he wasn't even on the gas anymore and pulled a truck length at 75-80mph and we stayed at that till about 118-120mph where we just couldn't go any faster. from a 35mph roll it was almost identical except he did not jump on me as much from the start, but after 65-70mph i pulled away every time. This race was duplicated twice as well.
Moral of my story is a Hemifever tuned RAM is equal to a tuned ecoboost. I dont want to say my truck was faster, or he won, or I won. but they were just different, I want to say power-wise we were the same, it was gearing that made the difference in the race. However, if I had an 8spd with 3.92's I think it would of been very different.