The real Donald trump

I have a question. I have 2015 Chevy Silverado rally 2 edition. It has the stock 22' black wheels, it's black with the ghost racing stripes, and bowtie, blacked out grill, 5.3 L v8 and 4×4. "Which is as I understand a 325 cu in." I bought the truck used in 2020 with 70 k miles. I honestly didn't know it was a rally when I bought it. I just thought it was regular Silverado with custom work from gm. Anyways my question is does the rally 2 have any engine or transmission upgrades? Or is it same HP and torque as the regular 5.3? Which is 355hp. I'm never hard on it. I don't hot ride it or let rpms get pass 3500 as long as I can help it. But I've got on it a couple times. Once against another 5.3 Chevy and other against a 2022 new mustang convertible and I pulled them both by a couple car lengths easily. I look at engine and don't see any turbo or superchargers but it's without a doubt faster then other 5.3 . I know I'll probably get hell for asking this lol. I'm no mechanic. I'm a part changer. I can take off and replace any part but as understand no mechanic. Just asking because I'm curious and can't find any info on book or the web thanks